Numerous Nirvana and KoRn albums and HIM early on (~2007-2008, i started playing in 2007), a bit later In Flames and Children of Bodom (2008-2009) and probably lots more that i can't think of right now.
EDIT: some more of my 'GW bands' are In Extremo, Immortal, Ensiferum, Amon Amarth. Later my metal phase faded a bit and i also listened to hands up and rap. but the strongest memories and nostalgia are from my early GW days of course.
Listening to certain albums or tracks now really gives me instant GW memories even when not playing, but when i do play while listening I really feel taken back to my teen GW years and i remember EXACTLY how it was back then and how addicted i was to the game.
Great thread idea btw!