In reply to Squidward Tenticles:
The only music over that part of the film is the track 'Yo Mama' from Zappa's Sheik Yerbouti album.
It starts during the film at about 16mins
and fades out at 18:25 before kicking back in at about 21:50. At about 22:26 the singing starts but again, it's the same track.
This is the whole track
At about 1:40 is where it starts to be used in the film, the bit before that (not in the film) has some singing before the guitar solo and ends with some singing, from 10:36 onwards which is used.
BTW the lead guitar is all Zappa.
Post edited at 14:04