Upon the release of their first album in the late '70s, Tom Petty & the Heartbreakers were shoehorned into the punk/new wave movement by some observers who picked up on the tough, vibrant energy of the group's blend of Byrds riffs and Stonesy swagger. In a way, the categorization made sense. Compared to the heavy metal and art rock that dominated mid-'70s guitar rock, the Heartbreakers' bracing return to roots was nearly as unexpected as the crashing chords of the Clash. As time progressed, it became clear that the band didn't break from tradition like their punk contemporaries. Instead, they celebrated it, culling the best parts of the British Invasion, American garage rock, and Dylanesque singer/songwriters to create a distinctively American hybrid that recalled the past without being indebted to it.