You can only listen to 3 bands/artists for the rest of your life.

Damn that's a hard choice..

I'd have to go with:

System of a Down - I've enjoyed almost every song on all of their CDs that i've ever owned, their old CDs alone would keep me busy for a majority of the time.

Ludacris - Wow, where can I start. Chicken and Beer alone is probably one of my favorite CDs of all time, great songs throughout the whole album, that and he's got a few new CDs after that, definately would keep me entertained for almost...well, ever.

Red Jumpsuit Apparatus - if you guys haven't heard of these fellas yet, they're a band (3 outta the 5 guys graduated at my highschool).. and they've been together since I was a freshman, their success has skyrocketed out of nowhere, it's amazing that a small town like I grew up would host such great talent like these guys have, now, they only have one Major release CD as of yet, but almost every song on the CD has a lot of heart and passion into it and it's great to listen to, and i'm sure they've got a long lifespan ahead of them, can't wait for more music, I'd definately recommend checking them out...