From Wikipedia:
Deadman's Curve is a 1978 made for TV film based on the musical careers of Jan Berry and Dean Torrence. Developed from a 1974 article published in Rolling Stone magazine by Paul Morantz, who also helped write the screenplay.
Cast:
Jan Berry: Richard Hatch
Dean Torrence: Bruce Davison
Annie: Pamela Bellwood
Dr. Vivian Sheehan: Floy Dean
Susan: Denise DuBarry
Billy: Kelly Ward
Bob "The Jackel" Smith: Wolfman Jack
Rainbow: Susan Sullivan
Also features cameo appearances by Dick Clark and Beach Boys Mike Love and Bruce Johnston. Also, Jan Berry himself and his parents appear in the audience at the end of the movie.