From co-founding the teen-punk trailblazers The Runaways in the '70s to dominating the pop charts in the '80s with her band The Blackhearts, Joan Jett is as influential a figure in rock history as there is. Her definitive version of the Arrows' “I Love Rock N Roll” became an anthem universal enough to double as a Britney Spears hit, while “Bad Reputation” and The Runaways' “Cherry Bomb” will endure as long as music supervisors need scuzzy-bubblegum attention-grabbers for soundtracks. Meanwhile, the pioneering Blackheart Records label she started in 1980 with former bandmate Kenny Laguna boasted a roster varied enough to include Metal Church and Big Daddy Kane.