Two days ago I muddled my way through "Jessica" on hard drums. The expert chart is just a little beyond my ability at this point, but that's okay since I'd already retreated back to hard on several others (curse you, Mitch Mitchell, and your witchcraft drumming!).
The victory was, that was the last tier-5 song in my collection. So far I have either passed without no-fail on expert, or 5-starred on hard, every song I have played. Now I have only 29 tier-6 songs to go, to see if I can boast that across the entire lbirary.