Old:
Bach

New:

Metal/Hardcore:

(Band - CD if listed)

In Flames - Whoracle
H.O.R.S.E the Band (this group is in a genre known as nintendocore)
Between the Buried and Me
The Red Chord
Nightwish

Alt(?):
Smashing Pumpkins - Mellon Collie and the Infinite Sadness

Rap:
Eminem - The Slim Shady LP, The Marshall Mathers LP
Dr Dre - The Chronic 2001
D12 - Devil's Night, D12 World
Everything by:
Tupac
Snoop Dogg
Notorious BIG
Nas
Jay-Z
Ol' Dirty Bastard(especially the Osirus album)

Rock:
Weezer
Green Day - Old stuff first, then try new stuff
The Killers


meh I'm giving up, I'm tired