Part of the loops were used alongside an element of the ending jazz sequence to make "The Bus", an incidental piece used at various points in the TV movie.

On the track, as recorded and officially released, Lennon plays the main theme on mellotron, accompanied by McCartney on bass and Harrison on guitars and Starr (on maracas and drums).

All four Beatles sing the melody without lyrics of any kind, and the track fades in an assortment of tape effects created by Lennon and Starr.

A different version can be found on some Beatles bootleg albums (such as Back-track 1), and features added Hammond organ and strange whistling noises in the early parts of the track.

This coda, which Mark Lewisohn speculated was "seemingly copied straight from an unidentifiable modern jazz record",[1] was in fact played on a mellotron.