While the film's music disappointed fans of the band's more traditional pop sound, it features what some critics considered to be some of The Monkees' best recorded work, including contributions by Carole King and Harry Nilsson. Jack Nicholson compiled the soundtrack album, which approximates the flow of the movie and includes large portions of the dialogue.[5] The film's incidental music was composed and conducted by Ken Thorne, who also composed and conducted the incidental music to the Beatles' second film, Help! The film's most famous song, "Porpoise Song (Theme from Head)", appeared at the film's start and finish and left viewers feeling they were watching something dreamlike: The editing of the bridge scene and the slow motion was almost meant to feel like a dream.