Over the last few days I've found myself playing Rock Band 2 again. At first I wasn't enjoying it as much, because I had lost my touch. My days of slamming expert mode and having my muscle memory kick in were gone. So over the last couple of sessions I've been fighting to get it back, which I have.
 
Tonight I unlocked the Endless Setlist 2. All 84 RB2 songs, one after the other. There are 1 or 2 songs that really still escape me, even on Hard. Battery by Metallica and I thiiiiink the Mastodon track as well. Any advice with these two? I'm talking strategy.
 
Also, about how long does the endless setlist take to complete? Any advice for this monumental task?