A truly classic songwriter's work can be interpreted by artists all over the stylistic map and still make an impact. When you hear Johnny Cash delivering a gravitas-laden acoustic take on "I Won't Back Down," Grace Jones crooning a sinuously sexy, reggae-inflected version of "Breakdown," or J Mascis imbuing "Don't Do Me Like that" with his trademark alt-rock guitar crunch, it quickly becomes clear that Tom Petty is an artist whose songs are for the ages.