-Minor Threat song
Blasphemy, though You're Wrong is a close second.
I don't listen to a lot of them cause of the irritating straight edge crowd but In My Eyes takes the cake.
fffffffuuuuck Umm... goddamn... either The Empire Strikes First or Against the Grain. A lot of people say Suffer but it's just not my favorite, although No Control is definitely in the top 5. Bad Religion is just on a different plateau.
I'd say The Offspring but I consider them a punk band who trolls the punk community because they're that awesome. Not counting them, I'd say Jimmy Eat World.
"A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects." - Time Enough For Love, by Robert Heinlein