Favorite Guitar Hero II song

I think it's called Dem Bones from Alice in Chains. I thought that song was super cool ever since i heard it in the Street Fighter II anime.

Since we're on the subject, would you guys recommend buying the song packs from the marketplace? I'm probably gonna get them, but some yea or nay opinions would be great.
 
I'm going to say now...just cause it is only three songs apiece. I'd wait it out and see if you release the 80's guitar hero songs for the marketplace...but so far i've only heard that they are going to keep it for PS2 only. But i'm keeping my fingers crossed.