[quote name='doctorofstyle']they any good? do i need to keep the disc to play the tracks or can i somehow copy them over to the hard drive?[/quote]
nope, you don't need the disc after they're copied to your hard drive. if you know some other folks that have the 360 version of Rock Band, maybe suggest going in on a copy of the magazine together to save a few bucks.
i've only tried the guitar parts, but i thought the Freezepop song "Sprode" was pretty good if you dig synth-style music (i've heard the song was also in Amplitude). Bang Camaro's song is a slower one with some tricky solos, and the Count Zero one isn't bad for a free track. then again, i'm a sucker for absolutely any Rock Band tracks, haha.