One of his smaller roles but one of his best.
At its heart, the film portrays, through a fictional band in 1973, the final steps in the slow creeping take over of Rock & Roll by corporate interests. In the eyes of some, such as Bangs, this absorption was squeezing the life, originality & innocence out of the music. The corporate homogenization of the music was inevitable once the right people realized how much money could be made.