Since that track is not on any of the soundtrack albums (not even on the Off-World and Bongo bootlegs), this has been some kind of a mystery, but most likely it’s simply one of those many little Vangelis gems that never made it to the soundtrack album. The vocals are definitely done by Demis Roussos.
In the BR Workprint, an instrumental version of “Qu’ran” by David Byrne and Brian Eno from “My Life in the Bush of Ghosts” was used in Taffey’s bar.
Posted in: 2. Other Music in BR