Even the in-game character has no idea what to do here.
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Guitar Hero/ Rock Band goals:
[X] Rock Band Blitz 1,000,000 points in BEER
[X] Rock Band Blitz 50+ bounce pinball
[X] FC Prequel to the Sequel X Guitar
[X] 5-star all three versions of TTFAF X Guitar
[X] 5-star Headed for the Ditch X Guitar
[X] GS Caprici di Diablo X Guitar
[ ] 5-star Roundabout X Pro Keys
[ ] Pass RB3 setlist on Medium Pro Guitar
[ ] Pass RB3 setlist on Medium Pro Bass
[X] RB3 Expert Bass FGFC
[X] Lego Rock Band Expert Guitar FGFC
[ ] Full music library vocals FC