Todd Haynes' atmospheric tribute to Bob Dylan, I'm Not There, was also warmly received, with the LA Times calling Cate Blanchett's portrayal of the enigmatic musician "phenomenal."
The documentary about Daniel Lanois' production work with artists like U2 and Sinead O'Connor, Here Is What Is, got good reviews for its ability to portray the creative process, making "something out of nothing," although even the "@U2" blog says its insider footage may be best appreciated by fans.
Finally, Rolling Stone calls Heavy Metal In Baghdad the "most powerful music film" at TIFF, a documentary about Iraq's "only heavy metal band," Acrassicauda. At one point in the film, their practice space is destroyed by a missile; now that's hardcore.
Rolling Stone's "Rock Daily" blog has a wrap-up on the music-themed films featured at this year's Toronto International Film Festival, and it turns out they're all pretty good: