I was thinking of a couple, but I've narrowed it down to:

Constant Mostion-Dream Theater $1.20

Aesthetics of Hate-Machinehead $1.20

Rock Rebellion-Bang Camaro-1.20

Life is beautiful-sixxam $1.20

Hysteria-Muse $2.40

Total comes to $7.20, but it's worth it 'cause I can transfer them to the next Rock Band when it comes out.

I will also be getting the following later on;

Blackened-Metallica

Peace of Mind-Boston

Behind Blue Eyes-The Who

Working Man-Rush (And it's not a cover!).

And Maybe N.I.B.-Black Sabbath.