I'm not sure how to describe punk. Although i feel like since the bands and leaders of the punk movement stopped it before it got popular, it stayed true to the real message. The epitome of punk is against the norm and what people like; if people catch on then it's a complete failure. Then one might ask, who did they pursue the movement for? If not for the rest of the "punk" population, then was it for themself? It all seems like a paradox to me. If you truly listen to the clash or a punk band, their sound is very unique. When people think of punk, electric guitars, piercings, tattoos, and all black skinny jeans come to mind. This is the media's version of "punk" and rebellion. http://www.poster.net/clash-the/clash-the-band-6500016.jpg If you actually look at the clash their wearing leather and very different clothing. The singing isn't ideal, but that's what makes them unique.
This is my personal favorite! Enjoy :)

http://www.youtube.com/watch?v=0hDeEIHlvwI