If you plan to attempt the "endless setlist", there are a couple of things you should know:
1. you can pause it, but not save it half way through
2. Any song you buy/download will be added to this set list (example- Timmy and the lords of the underworld)
3. It goes in order of difficulty
4. Play one level down from the one you think you can play because making it to the 57th song out of 58 songs and not being able to get through it SUCKS!
and most important!
5. Make sure it is well ventilated because after playing for 6 hours straight you will fry it and have to buy a new 40GB (since they aren't making 80GB right now) from Target (since they have a 90 day return policy even if you open it and play with it) so you can still play GTA while you wait for Sony to send you a box and repair yours....
and don't forget to blink
