The 3 most hardcore warm-up songs ever:

"Die Mother F'ers"--Geto Boys (circa 1992--ORIGINAL gangsta rap)

"Natural Born Killaz" --Dr. Dre and Ice Cube

"When a Man Loves a Woman" --Michael Bolton


Also, Motley Crue, ACDC, Metallica, and GNR had all become cliche by the time I was in 9th grade, and that was like 10 years ago. I like bigkneepads' list. Some good modern rock.