Tom Petty? Ehhh, 7/10.
You guys know that my music is strictly underground, except for a few select artists who are "considered" mainstream that I only listen to their older music. But with all genres of music, I always stay underground, because everything on the radio today that isn't coming off an "oldies" station sounds entirely like shit.
So, in a change of pace instead of an underground rap artist, here I will give you an underground rock group: