Each release of "Paranoid Android" included one or more B-sides. "Polyethylene (Parts 1 & 2)", included on the CD1, 7-inch vinyl, and Japanese releases of the single, were a multi-section piece formatted much like "Paranoid Android" itself. The first part of the song consists of Yorke's vocals over acoustic guitar; the second part contains distorted guitar and organ and uses complex time signature changes. "Pearly*", featured on the CD1 and Japanese releases of the single, was described by Yorke as a "dirty song for people who use sex for dirty things". "A Reminder", which appears on the CD2 release, features fuzzed guitar, thumping drums, and electric piano. According to Yorke, this song was inspired by "this idea of someone writing a song, sending it to someone, and saying: 'If I ever lose it, you just pick up the phone and play this song back to remind me.'" "Melatonin", also on the CD2 release, is a synthesiser-based song with lyrics similar to that of a lullaby, but with an undercurrent of menace in lines like "Death to all who stand in your way". The "OK Computer" track "Let Down" is also included on the Japanese single.