Altered State was an American progressive rock band based in Huntington Beach, California, active in the 1990s. Influenced by Pink Floyd, Rush, Led Zeppelin and U2, they have been described as "an inventive band with unique arrangements, melodic vocals and great harmonies."

Altered State was formed in 1990 in Huntington Beach, California by vocalist/guitarist Gregory Markel, drummer Chip Moreland and guitarist Curtis Mathewson, previously performing together in the band Show of Hands. In 1990, Altered State signed with Warner Bros. Records

In 1991, the band released their eponymous debut album and the first single, Step Into My Groove. The 1992 single Ghost Beside My Bed, went #1 at Rock Radio in several states in the U.S. It was the most requested song on KQLZ Pirate Radio, the station set up a special show for the band at The Roxy in Hollywood, California. Gregory Markel's performance that night is highlighted in Vicki Hamilton's book Appetite for Dysfunction: A Cautionary Tale.

In 1993, the band released :[dos]:

Singles

Videos

Demos/live releases

Songs covered by other artists