With summer surprise "Once" still selling soundtracks, Ian Curtis docudrama "Control" in theaters and Todd Haynes' Bob Dylan project "I'm Not There" close behind, 2007 seems to be a cinematic year with unusually high focus on music past and present. David Carr reports on those and upcoming projects, including Martin Scorcese's Rolling Stones documentary, another Dylan doc and Peter Bogdanovich's "Runnin' Down a Dream," which focuses on Tom Petty and the Heartbreakers.