it would have been helpful if you told us whats on your current play list.
but try some of this stuff.
Rush - La villa strangiato
Dimmu borgir - burn in hell
Prodigy - Firestarter and Breathe
Ours - ANything form Distorted Lulabies
Tool - Any thing from Ænema and Undertow should be good
Bjork - fucking in rythm and sorrow
butthole surfers - any thing form independant worms saloon
Champs - Tequila (a classic)
the Kinks - all day and all of the night (another classic)
Jethro Tull - get the Aqualung album
In flames - dawn of a new day
I think you already know about MSI ... but still get their stuff
NIN - so much to choose form ... try stuff from "The downward spiral"
Pink Floyd ... so many good songs ... try stuff form the wall and dark side of the moon.
Switchblade symphony - Gutter glitter and copy cat
The cult - rise
The melvins ... just try their stuff
Third eye open ... their a string tribute to tool
voodoo glow skulls - the delinquient song
Millencollin - lozin' must
Animals - house of the rising sun
Barry mc Guire - eve of distruction
Ben Harper - please bleed and his live guitar solo
big wreck - still holding and lady like
bill hicks ... ok it's not music but still try his comedy .. it's great.