Movie has music about rock n roll with predominate bob seger music

Sounds like the Bakshi
Film,.

American Pop

Three generations of musically gifted young men
Come within reach of making a name for themselves
Only to fall short due to tragedy .The story spans
Vaudeville to the 80's rock scene. The great grandson
Of the Vaudevillian finally won the hard won fame and
Fortune denied the previous three generations of men
In his family

view trailer (http://www.youtube.com/watch?v=2U7sY6fgrXs)