"Bike" is a song by British psychedelic rock band Pink Floyd, and is featured on their debut album, The Piper at the Gates of Dawn (1967).
In the song, Syd Barrett's lyrical subject shows a girl his bike (which he borrowed), a cloak, a homeless mouse that he calls Gerald, and a clan of gingerbread men—because she "fits in with [his] world". Towards the end of the song, he offers to take her into a "room of musical tunes". The final verse is followed by an instrumental section that can be referred to as a piece of musique concrète: a noisy collage of oscillators, clocks, gongs, bells, a violin, and other sounds edited with tape techniques, apparently the "other room" spoken of in the song and giving the impression of the turning gears of a bicycle. The ending of the song fades out with the modulated and abstracted squeak of a bicycle horn. The song was written for Barrett's then girlfriend, Jenny Spires. She is also mentioned in the song "Lucifer Sam", which is also on The Piper at the Gates of Dawn.