...therightbullets gave to me: Metallica. An inevitable choice but a difficult one to write because they are so fucking massive ^_^.
They did invent heavy metal though, before they came along in 1981 it was just barber shop quartet and chanting. Also If memory serves me they invented instruments too. There were no instruments as we know them before Metallica, then '81 rolled around and BAM. Seriously though, I have frequent dreams where Hetfield and Ulrich chase down and beat the living daylights out of Bono. That makes me happy.
The Four Horsemen
"So gather round young warriors now
And saddle up your steeds
Killing scores with demon swords
Now's the death of doers wrong
Swing the judgment hammer down
Safely inside armor blood guts and sweat"