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"Soft Kitty" is a children's song, popularized by the characters Sheldon Cooper, Penny, Leonard Hofstadter, Mary Cooper, and Amy Farrah Fowler (who sang the song in English, German, and Mandarin) in the 2007-2019 American sitcom The Big Bang Theory, and which elsewhere may be rendered as "Warm Kitty."[1] It is described by Sheldon as a song that his mother (Mary) sang to him when he was ill.

The lyrics on The Big Bang Theory are: "Soft kitty, warm kitty, little ball of fur/ Happy kitty, sleepy kitty, purr purr purr". A scene in an episode of Young Sheldon, the prequel series to The Big Bang Theory, depicts the origin of the song. This aired on February 1, 2018, and shows Mary singing the song to her son, who is suffering with the flu.[2]

A 2015 copyright lawsuit alleged the words to "Warm Kitty" were written by Edith Newlin; however, the lawsuit was dismissed because the court found that the plaintiffs failed to show they had a valid claim.[3][4][5][6]

Origin

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"Wlazł kotek na płotek" as it appears in Pieśniach ludu polskiego (1857)

The song is originally based on a Polish lullaby, "Wlazł kotek na płotek" ("The kitten climbed the fence").[7] The lyrics were noted by folklorist Oskar Kolberg in 1837, and the tune was first published by Stanisław Moniuszko in 1849, based on a Polish folksong. Władysław Syrokomla and Wiktor Każyński published a version of this song in 1857, in Pieśniach ludu polskiego ("Songs of the Polish people").[8]

The 1972 Tom Glazer album Music For 1's & 2's features the song under the title "Nice"

Versions of the song have been released by Australian children's performer Patsy Biscoe,[9] and by the long-running ABC children's program Play School[10]—a recording sung by Philip Quast and Barbara Frawley was released on the show's 1993 album The Best of Play School,[9][11] which predates The Big Bang Theory and has the lyrics reversed, instead going: "Warm kitty, soft kitty, little ball of fur. Sleepy kitty, happy kitty, purr purr purr."[citation needed] The song remains part of Play School's catalog of children's songs regularly performed[9] on the program: the show's presenters occasionally perform the song for their young viewers.[citation needed]

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In December 2015, the heirs of Edith Newlin filed a lawsuit against the various companies associated with The Big Bang Theory,[12] claiming that the words and music to the song appeared in the book Songs for the Nursery School published in 1937 by Willis Music Company,[5] based on a poem by Newlin;[3][4] the copyright to the book was renewed in 1964.[13] The website for Willis Music states:

In 1937 we published a book called Songs for the Nursery School and we sold tens of thousands of copies. It is a hardbound book of over 150 songs for children. The book was written by Laura Pendleton MacCarteney. In that book on page 27 is 'Warm Kitty'.... Warner Brothers and I worked together to secure the rights for the show The Big Bang Theory and they have been using the song ever since.[14]

The suit by Newlin's daughters, on the other hand, claimed that they held the copyright. Furthermore, they alleged that they did not authorize the use of the lyrics, that Willis Music did not have permission to authorize others to use the lyrics, and that the lyrics had been used not only in the television series but on various kinds of program-associated merchandise without proper permission.[3]

On March 27, 2017, US District Court Judge Naomi Reice Buchwald dismissed the suit, holding that the plaintiffs had not shown that they held a copyright on their mother's lyrics:[15] "They have failed to establish that they own a valid copyright as necessary to state a copyright infringement claim."[6]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia
from Grokipedia
Soft Kitty is a children's lullaby that gained widespread popularity through its use in the American sitcom The Big Bang Theory, where it is sung by the character Sheldon Cooper as a comforting song his mother recited to him during childhood illnesses.[1] The lyrics, adapted as "Soft kitty, warm kitty, little ball of fur, happy kitty, sleepy kitty, purr, purr, purr," originate from a 1930s poem titled "Warm Kitty" written by American poet and teacher Edith Newlin, which appeared in the collection Songs for the Nursery School.[2] The melody for the version featured in the show derives from the 19th-century Polish folk lullaby "Wlazł kotek na płotek" (translated as "The Kitten Climbed the Fence"), a traditional tune documented by ethnographer Oskar Kolberg in Warsaw.[3] Introduced in the 2008 episode "The Pancake Batter Anomaly" of The Big Bang Theory, the song became a recurring motif, often performed by cast members including guest appearances by actors like Bill Nye and Carrie Fisher, highlighting Sheldon's vulnerability and endearing quirks.[1] Its cultural impact extended beyond the series, inspiring merchandise, covers, and even a depiction of its in-universe origin in a 2018 episode of the prequel Young Sheldon, where a young Sheldon requests the song from his mother.[4] The song's use led to legal controversy in 2015 when Newlin's daughters filed a lawsuit against Warner Bros. Television, alleging unauthorized adaptation and performance of their mother's copyrighted lyrics without proper compensation, though the case was dismissed by a judge in 2017.[5] Despite the adaptation changing "warm kitty" to "soft kitty," the lawsuit underscored the lullaby's pre-existing roots and the show's reliance on public domain elements for its melody.[2] Today, "Soft Kitty" remains an iconic element of pop culture, symbolizing comfort and nostalgia for fans of the series.[6]

History and Origin

Pre-20th Century Roots

The 19th century marked a pivotal era for the preservation of Polish cultural identity under the partitions imposed by Russia, Prussia, and Austria, which fragmented the nation and suppressed its traditions. In response, ethnographers and folklorists like Henryk Oskar Kolberg (1814–1890) launched systematic efforts to document rural customs, music, and oral literature before they vanished amid modernization and assimilation. Kolberg, a composer and self-taught scholar, conducted field expeditions starting in 1839, traveling across Polish territories to record songs, dances, and rituals from peasants, emphasizing their role in national heritage. His work reflected broader Romantic-era interests in folklore as a source of authentic, pre-industrial expression, with Kolberg warning that traditional music teetered on extinction due to urbanization.[7][8] Kolberg's most influential contribution was Pieśni ludu polskiego (Songs of the Polish People), published in 1857, which assembled over 400 folk ballads alongside a comparable number of dance tunes transcribed from oral sources in regions like Mazovia and Silesia. This two-volume set, accompanied by piano arrangements, stood as an early cornerstone of musical ethnography, prioritizing fidelity to regional variants while making the material accessible to urban audiences. The collection not only preserved melodic structures but also contextualized songs within daily life, from work chants to lullabies, underscoring their communal and improvisational qualities.[9] One such lullaby in the collection is the tune of "Wlazł kotek na płotek" (The Kitten Climbed onto the Fence), documented by Kolberg around the mid-1850s from Warsaw-area sources. The melody, simple and repetitive in a major key, evokes the gentle rhythm of a cradle song, with ascending phrases mimicking playful motion. The original lyrics, as notated by Kolberg, center on a whimsical cat-themed narrative: a kitten scales a low fence and winks mischievously, prompting a chain of animal antics—a rooster perches on a wall and crows, all framed as a "beautiful little song, not too long" that invites no mockery. These verses, structured in short rhyming couplets, highlight everyday rural imagery and humor to engage children, fostering imagination through animal personification and sound imitation.
Wlazł kotek na płotek i mruga,
piękna to piosenka, niedługa.
Wlazł kurek na murek i pieje,
niech się nikt z tych piosenek nie śmieje.
As a pre-1923 folk composition published in Kolberg's collection, the melody of "Wlazł kotek na płotek" resides firmly in the public domain under international copyright conventions, freeing it from proprietary claims and facilitating its integration into diverse cultural repertoires. This status has allowed the tune to underpin numerous children's songs and lullabies worldwide, adapting to local languages and themes while retaining its soothing, ascending contour. One early example of such adaptation appeared in the 1937 English version "Warm Kitty."[3]

1937 Publication as "Warm Kitty"

In 1937, Edith Newlin, a nursery school teacher based in Alstead, New Hampshire, composed the lyrics for "Warm Kitty" as a gentle poem intended to soothe and entertain young children.[10][11] Newlin, who spent approximately 35 years working in early childhood education, crafted simple, rhythmic verses to support her teaching efforts in fostering comfort and imagination among preschoolers.[12] The poem appeared that same year in the compilation Songs for the Nursery School, published by the Willis Music Company in Florence, Kentucky.[5][13] Titled "Warm Kitty," it was set to a melody derived from a traditional Polish folk tune, providing a lullaby-like structure suitable for classroom use.[14] The original lyrics read: "Warm kitty, soft kitty, little ball of fur. Sleepy kitty, happy kitty, purr, purr, purr."[14] This concise rhyme emphasized warmth, contentment, and the playful imagery of a curled-up cat, aligning with Newlin's focus on accessible, repetitive language to engage toddlers.[2] Despite its inclusion in a specialized songbook for educators, "Warm Kitty" garnered little attention beyond niche educational circles and remained largely unknown to the wider public until its adaptation in the 21st century.[1]

Role in The Big Bang Theory

Debut and Key Episodes

"Soft Kitty" debuted in the first season of The Big Bang Theory, specifically in episode 11, titled "The Pancake Batter Anomaly," which aired on March 31, 2008. In this episode, Sheldon Cooper, portrayed by Jim Parsons, catches a cold from neighbor Penny, played by Kaley Cuoco, after she returns from visiting family in Nebraska, and his friends leave to avoid caring for him. He insists that Penny sing the song to him as a comforting ritual originally taught by his mother during childhood. Penny, unfamiliar with the tune, learns the lyrics from Sheldon and performs it a cappella while he lies in bed, marking the song's introduction as a humorous yet endearing element of Sheldon's character.[15][1] The song reappeared in subsequent seasons, evolving from a one-off gag into a recurring motif used in moments of vulnerability or illness across the series' 12 seasons. For instance, in season 3, episode 8, "The Adhesive Duck Deficiency," aired on November 16, 2009, an injured Penny asks Sheldon to sing "Soft Kitty" to her, and they perform it together as a round, reversing their usual roles. Similarly, in season 8, episode 13, "The Anxiety Optimization," aired on January 29, 2015, Leonard Hofstadter (Johnny Galecki) and Penny join to sing it as a lullaby to help an insomniac Sheldon fall asleep during an experiment to boost his productivity. These variations demonstrate the song's adaptability in group settings and its integration into everyday interactions among the characters.[16] Further key appearances underscore the song's persistence as a ritual. In season 5, episode 6, "The Rhinitis Revelation," aired on October 27, 2011, Sheldon's mother Mary sings "Soft Kitty" to him after he gets sick from being caught in the rain. In season 10, episode 20, "The Recollection Dissipation," aired on April 6, 2017, Amy Farrah Fowler (Mayim Bialik) sings "Soft Kitty" to a sick Sheldon in English, German, and Mandarin Chinese, accompanied by an autoharp, showcasing a personalized and multilingual rendition to soothe him while he recovers from exhaustion. The song's final on-screen performance occurs in season 12, episode 19, "The Inspiration Deprivation," aired on April 18, 2019, where Sheldon sings it to comfort Amy during a moment of distress, closing its arc as a symbol of mutual support after spanning the entire series. This progression from Sheldon's personal comfort—rooted in his mother's childhood lullaby—to a shared ensemble tradition illustrates how "Soft Kitty" became a beloved recurring feature over 279 episodes.[17]

Significance to Characters

In The Big Bang Theory, the "Soft Kitty" song serves as a pivotal element in revealing Sheldon Cooper's vulnerability, acting as a mechanism for regression to childhood comforts during illness or distress.[18] Introduced as a lullaby sung by his mother Mary when he was sick, it underscores Sheldon's aversion to change and his reliance on familiar rituals to cope with physical or emotional upheaval.[19] This recurring request highlights his need for predictability, transforming a simple tune into a symbol of emotional security that humanizes his otherwise rigid persona.[20] The song's interactions with Penny establish a caregiver dynamic that evolves into an affectionate tradition, fostering mutual trust in their platonic relationship. Penny's initial reluctant performance of "Soft Kitty" for a sick Sheldon marks a turning point, positioning her as a nurturing figure who penetrates his defenses.[21] Over time, this ritual reinforces their bond, as seen when they sing it together during her injury, reversing roles and emphasizing reciprocal care without romantic overtones.[22] Similarly, Leonard's awkward attempts to join in singing "Soft Kitty," such as in moments of group support, reinforce the enduring friendship bonds within the core group, illustrating how even imperfect efforts contribute to Sheldon's sense of stability.[23] Amy's rendition of the song in later seasons symbolizes the deepening romantic partnership between her and Sheldon, integrating it into their intimate dynamic as a gesture of emotional partnership. By performing "Soft Kitty" in multiple languages during his distress, Amy adapts the ritual to affirm her role as his primary emotional anchor, blending intellectual compatibility with tender support.[17] Mary's continued use of the song ties it to family heritage, evoking Sheldon's Texas roots and the nurturing influence that shaped his coping mechanisms.[18] Thematically, "Soft Kitty" illustrates neurodivergence through Sheldon's adherence to routines for comfort, portraying his traits—such as social challenges and emotional regulation needs—as integral to his character without overt sentimentality. It underscores platonic intimacy among the group, where shared vulnerabilities strengthen connections, offering a lens into neurodivergent experiences via everyday rituals.[19]

Lyrics and Composition

Full Lyrics in the Show

In The Big Bang Theory, the "Soft Kitty" song is performed as a simple lullaby with two identical verses, each consisting of the following lyrics: "Soft kitty, warm kitty, little ball of fur. Happy kitty, sleepy kitty, purr purr purr."[24] The verse is typically repeated twice in full during performances, creating a soothing, repetitive structure that emphasizes comfort.[5] This version adapts the original 1937 "Warm Kitty" poem by swapping the order of adjectives in the opening line from "warm kitty, soft kitty" to "soft kitty, warm kitty," and in the second line from "sleepy kitty, happy kitty" to "happy kitty, sleepy kitty," enhancing the rhythmic flow and thematic gentleness suitable for a television lullaby.[11] Performances are usually delivered a cappella in a soft, hushed tone, with the "purr purr purr" ending drawn out and emphasized to mimic a cat's purring and amplify the calming effect.[24] Variations occur across episodes, such as a slower tempo and more deliberate pacing when the character Sheldon Cooper is especially unwell, adding emotional depth to the rendition without altering the core lyrics.

Melody and Musical Structure

The musical structure of "Soft Kitty" as adapted for The Big Bang Theory is notably simple, employing 4/4 time signature to facilitate its role as an accessible lullaby.[25][26] This common meter supports a straightforward verse form, characterized by repetitive phrases across four short lines that repeat without a distinct chorus, enhancing ease of singing and memorization.[27] The song is typically set in a major key, such as C major or G major, which contributes to its bright, comforting tonality.[28] The melody follows an undulating ascending-descending pattern reminiscent of traditional lullabies, designed to evoke soothing and gentle motion. Each phrase consists of 4 to 6 notes, often diatonic and centered around the pentatonic scale for simplicity; in C major, it commonly begins on the dominant G and descends stepwise before rising slightly, as in the sequence G-E-E-F-D-D for the opening "Soft kitty, warm kitty."[27][29] This contour, with its limited range and balanced rises and falls, promotes a calming, repetitive flow suitable for vocal performance. Rhythmically, the song maintains a gentle quarter-note pacing throughout, aligning with the 4/4 meter to create a steady, unhurried pulse that mirrors a rocking or cradling motion.[26] The concluding "purr purr purr" incorporates elongated notes, stretching the final syllables for an onomatopoeic effect that imitates a cat's sound and prolongs the soothing resolution.[27] While "Soft Kitty" is predominantly presented a cappella in the series to emphasize character interactions, its uncomplicated harmonic framework—relying on primary chords like I (C), V (G), and occasional dominant seventh (G7) or subdominant (F)—makes it highly adaptable for instrumental accompaniment on guitar or piano.[28][27] The melody, derived from a traditional 19th-century Polish folk tune, is in the public domain, enabling unrestricted adaptations and arrangements without legal constraints on the tune itself.

Cultural Reception and Legacy

Popularity and Merchandise

Following its debut in The Big Bang Theory, the "Soft Kitty" song quickly gained viral traction online, with the original 2008 episode clip accumulating over 5 million views on YouTube by 2025.[30] Additional compilations and fan-uploaded versions further amplified its reach, contributing to millions of total views across platforms during the 2010s, driven by shares on social media and early streaming sites.[31] This surge aligned with the show's peak popularity, turning the lullaby into a recognizable meme symbolizing comfort and nostalgia among viewers.[20] Fan engagement extended "Soft Kitty" into broader pop culture, where it inspired memes referencing Sheldon's vulnerability and the song's soothing melody, often shared in geek and sitcom communities.[32] At conventions like San Diego Comic-Con, audiences participated in live sing-alongs led by the cast, such as the 2010 panel performance and the 2017 Hall H event featuring extended lyrics with animal variations.[31] These interactive moments solidified its status as a communal ritual for fans, evoking the show's themes of friendship and quirkiness. Warner Bros. capitalized on the song's appeal through official merchandise lines, including plush kitten toys, T-shirts printed with lyrics, coffee mugs, key chains, and sherpa blankets featuring the "Soft Kitty" design.[33] Apparel like graphic tees became staples in fan wardrobes.[34]

Covers, Parodies, and Adaptations

The song has been adapted in the prequel series Young Sheldon, where it originates as a lullaby sung by Sheldon's mother, Mary Cooper, to soothe him during a bout of the flu in the episode "A Sneeze, Detention, and Sissy Spacek," which aired on February 1, 2018.[35] This depiction ties the tune directly to Sheldon's childhood, providing backstory for its recurring use in The Big Bang Theory.[36] Within The Big Bang Theory, the song receives multilingual adaptations, notably in season 10, episode 20 ("The Recollection Dissipation"), where Amy Farrah Fowler sings it in English, German ("Weiches Kätzchen, warmes Kätzchen, kleiner Ball aus Fell. Fröhliches Kätzchen, schläfriges Kätzchen, schnurr, schnurr, schnurr"), and Mandarin Chinese to comfort an ailing Sheldon. These versions maintain the original melody while translating the lyrics for cultural resonance.[37] The melody's simple, repetitive structure has inspired various musical covers, including lullaby renditions designed for relaxation and sleep. For instance, Anime Kei and Millie Appleton released a soothing instrumental version in 2013 as part of a children's lullaby collection.[38] By the early 2020s, the song appeared in pet relaxation tracks, such as those by Pet Relax Academy, aimed at reducing anxiety in cats through calming audio.[39] In other media, the song has been featured in advertisements, including a 2014 promotional spot for South African medical scheme Medihelp, which incorporated the lyrics to highlight comfort during illness.[40] Additionally, the full cast and crew performed a group version at San Diego Comic-Con's Hall H panel in July 2017, altering the lyrics to reference various animals for comedic effect.[41] These live interpretations underscore the song's versatility in fan and promotional contexts. On December 28, 2015, Ellen Newlin Chase and Margaret Chase Perry, the daughters of Edith Newlin, filed a copyright infringement lawsuit in the United States District Court for the Central District of California against Warner Bros. Television and Chuck Lorre Productions, alleging unauthorized use of lyrics from their mother's 1937 song "Warm Kitty" in the television series The Big Bang Theory.[34][5][42] The plaintiffs claimed that "Warm Kitty," originally published in the 1937 songbook Songs for the Nursery School by Willis Music Company with lyrics attributed to Edith Newlin, formed the basis for the show's "Soft Kitty" lullaby, which debuted in a 2008 episode and was subsequently featured multiple times.[34][2][43] They asserted that the copyright for the songbook was renewed in 1964 by Laura Pendleton MacCarteney under applicable U.S. copyright laws, and that this renewal maintained ownership of the lyrics, with the show's adaptation constituting direct infringement without permission or compensation.[43][2] The suit sought unspecified damages, along with unpaid royalties from the song's use in episodes, merchandise, and fan promotions.[34][5][42] In response, the defendants argued that they had obtained proper permission to use the song by licensing it through Willis Music Company, the original publisher, which they believed held the rights to the lyrics at the time.[44][11] They further contended that the "Soft Kitty" lyrics were not substantially similar to Newlin's "Warm Kitty," highlighting key differences such as the replacement of phrases like "warm kitty" with "soft kitty" and other variations that altered the original structure and wording.[44][2] Additionally, the defense maintained that the melody derived from a public domain folk tune, predating Newlin's work, and that the show's creators had no proven access to the specific 1937 lyrics during development.[44][43]

Court Ruling and Aftermath

In March 2017, United States District Judge Naomi Reice Buchwald dismissed the copyright infringement lawsuit filed by Ellen Newlin Chase and Margaret Chase Perry against Warner Bros. Entertainment, CBS Corporation, and related entities. The court ruled that the plaintiffs failed to plausibly allege ownership of a valid copyright in the "Warm Kitty" lyrics, as required under the 1909 Copyright Act governing works published before 1978. Specifically, the judge determined that Edith Newlin's contribution to the 1937 songbook Songs for the Nursery School—published by Willis Music Company—entered the public domain in 1965 upon expiration of the original 28-year copyright term, because Willis Music's 1964 renewal applied only to the composite work and not to Newlin's individual lyrics without evidence of an assignment of renewal rights from Newlin or her heirs.[11][44][45] The dismissal was granted under Federal Rule of Civil Procedure 12(b)(6) for failure to state a claim, with the court rejecting the plaintiffs' arguments that the renewal retroactively protected Newlin's contribution or that precedents like Goodis v. United Artists extended renewal rights to unassigned contributions in collective works. Buchwald emphasized that the plaintiffs' complaint lacked factual support for any transfer of ownership, rendering their infringement claims untenable.[6][44] The plaintiffs filed a notice of appeal to the United States Court of Appeals for the Second Circuit on April 25, 2017, challenging the district court's interpretation of renewal rights under the 1909 Act. The appeal (docketed as 17-1234) focused on whether heirs of a contributor to a copyrighted collective work could independently renew and claim ownership of that specific contribution after the original term expired.[46][47] In August 2017, the parties reached a confidential settlement, resolving the appeal without a judicial decision from the Second Circuit. The terms of the settlement were not publicly disclosed. The lawsuit had no discernible impact on the production or broadcast of The Big Bang Theory, which continued to feature "Soft Kitty" in subsequent episodes, including its final season in 2019.

References

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