multi player(rock band) or single player?

Well,Christmas is coming up and i can get a game of my choise.I hav been considering rock band but i dont know if i should get rock band or more single player based game like skate or blacksite area 51 or COD 4 ect. The thing is i dont have anyone in my family to really play rock band with but i can bring my friends over on the weekend.So i dont know if waiting for the weekend and playing rock bandsingle playeruntil then is all that great.So tell me your opinion, single player game or rock band?

If you don't have live or don't play multiplayer much, then I would say go for Rock Band if you really like that type of game.it is fun to be able to play drums or guitar even by yoursel. If you like to play FPS multiplayer, go for COD4 first, it rocks online and the single player is good too. Since Rock band is the same as about3 games, then also get Halo 3, and orange box. If you have any of those already, get mass effect or assasins creed more for single player. Not sure about blacksite, but skate would be a good choice too.

Tough choice though.