(1) the movie was originally released in 1981 (not sure in which countries) under the title "violent streets";
(2) the bar in which the band was playing was called "katz & jammer";
(3) the group playing in the bar was called the "mighty joe young band." (a group with this name has several cd titles available on amazon, etc.);
(4) members of the mighty joe young band (or the actors playing them) are/were thomas giblin, willie hayes, conrad mocarski, benny turner, william l. petersen and steve randolph;
(5) aside from tangerine dream, the only other credits for music were give to craig safan.
at least it's a start. hope it helps. BTW, i really like this movie and the soundtrack, particularly on japanese vinyl. -cfb