Pietro Mascagni (7 December 1863 – 2 August 1945) was an Italian composer primarily known for his operas. His 1890 masterpiece Cavalleria rusticana caused one of the greatest sensations in opera history and single-handedly ushered in the Verismo movement in Italian dramatic music. While it was often held that Mascagni, like Ruggero Leoncavallo, was a "one-opera man" who could never repeat his first success, L'amico Fritz and Iris have remained in the repertoire in Europe (especially Italy) since their premieres.

Mascagni wrote fifteen operas, an operetta, several orchestral and vocal works, and also songs and piano music. He enjoyed immense success during his lifetime, both as a composer and conductor of his own and other people's music and created a variety of styles in his operas.

Mascagni was born on 7 December 1863 in Livorno, Tuscany, the second son of Domenico and Emilia Mascagni. His father owned and operated a bakery. Giovanni Targioni-Tozzetti ("Nanni") was born the same year in the same city and became Mascagni's lifelong friend and collaborator.

In 1876, at the age of 13, Mascagni began musical studies with Alfredo Soffredini, who founded the Instituto Musicale di Livorno (later called Istituto Cherubini). Soffredini had just completed his musical studies in Milan. Also a native of Livorno, Soffredini was a composer, teacher and musical critic. Mascagni started composing rapidly: between 1879 and 1880, he wrote several works: Sinfonia in do minore, Prima sinfonia in fa maggiore, Elegia, Kyrie, Gloria and Ave Maria.

The premiere of Mascagni's first cantata, In Filanda, took place at the Istituto Cherubini on 9 February 1881. Performed at a musical contest in Milan, the cantata won the first prize. In the same year, Mascagni met the musicians Arrigo Boito and Amilcare Ponchielli in Milan.

In 1882, he composed his Cantata alla gioia from a text by Friedrich Schiller, followed by La stella di Garibaldi for voice and piano, and La tua stella. On 6 May Mascagni left Livorno for Milan. He passed the admission examination of the Milan Conservatory on 12 October. In Milan, Mascagni met the noted composer Giacomo Puccini, and was a student of Amintore Galli, artistic director of the Casa Musicale Sonzogno [it].

On 9 January 1883, Mascagni's sister, Maria, died. The cantata In Filanda became Pinotta, and was proposed for the musical contest of the Conservatorio, but as his registration was late, it was not accepted.

In 1884, he composed Ballata for tenor and piano; M'ama non m'ama, scherzo for soprano and piano; Messagio d'amore, and Alla luna.