Though Petty was in need of a decent electric, the two Heartbreakers quickly landed on a sound that would define their guitar ...

You can listen to Tom Petty’s isolated vocals on “Free Fallin’” via the video below: Petty’s sound was distinct, and that applied to his voice as well. Nobody sounded like him.

Petty had started out as a bass player, but when he moved to electric the seeds of one of rock’s greatest guitar partnerships ...