Petra Haden is not your typical musician. When she decided to cover the Who's album "The Who Sell Out," she didn't get a backing band, she recreated every guitar lick, every drum hit using her voice.

Her latest acapella album "Petra Goes to the Movies" features this LA vocalist singing famous film scores. Petra joins Alex Cohen with more.

RELATED: Petra Haden and choir give soaring voice to movie scores at the Getty