I Am King Tony - "Stereo Stereo" available on RBN!
rockband.com/songs/UGC_5004879
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I doubt We Will Rock You will be Tier 0 on Guitar. The solo is pretty gnarly by L:RB's standards.
I'm guessing that Fire will be the hardest song overall (depends on how much of the vocals are talkies.)
Hardest for Guitar: Final Countdown.
Hardest for Vocals: I Want You Back.
Hardest for Drums: Aliens Exist/Fire
Hardest for Bass: Iunno... maybe A-Punk or In Too Deep
Those are my guesses
I Am King Tony - "Stereo Stereo" available on RBN!
rockband.com/songs/UGC_5004879
IAmKingTony @ Facebook, YouTube, and Twitter
Also, just to nitpick; Walking on Sunshine will probably be Tier 4 or 5 on Vocals due to the improvisation at the end. It was pretty crazy on the Band Hero demo.
Wow, the tiers Zephiel posted make it clear the difficulty curve of L:RB is way different than RB2. Still, I wonder what that means for some of the DLC. For example, I'm guessing All Right Now is "family friendly" enough to be permitted into the Lego DLC catalog, but that's one of the hardest vocals out there. Hard to imagine it sharing the same tier as "So What."
Blitz megapack! http://www.rockband.com/forums/showthread.php?t=232207
RB4 setlist: http://www.rockband.com/forums/showthread.php?t=214620