"Main Theme" is an instrumental track by English band Pink Floyd on their third album, More. The track is played at the beginning of the film, when Stefan is waiting for someone to pick him up along a road to Paris.
The track begins with a panning gong that lasts as a drone sound for the whole piece; at 0:30 the Farfisa organ starts a progression of modal chords, that fades at 1:12 into a drum-bass iterative sequence, similar to, but slower than, the one featured at the opening of "Let There Be More Light". The organ played through a wah-wah pedal (1:20) plays a progression of background notes over the drum-bass line, while the untreated organ plays the main melodic notes (2:10). The slide guitar plays from the middle of the piece onward. The CD writing credit omits Mason.