 The backwards (or backmasked) guitar solo on "I'm Only Sleeping" was similarly unprecedented in pop music, in that Harrison deliberately composed and recorded his guitar parts with a view to how the notes would sound when the tape direction was corrected.The band's interest in the tones that resulted from varying tape speed (or varispeeding) extended to recording a basic track at a faster tempo than they intended the song to sound on disc.During the sessions, Emerick recorded McCartney's bass guitar amplifier via a loudspeaker, which Townsend had reconfigured to serve as a microphone, in order to give the bass more prominence than on previous Beatles releases.