I finally got past Reptilia. stupid song. I did much better singing in my natural octave; I'd been singing an octave lower and couldn't hit the lowest notes consistently.
I also posted a top-10 score on Brass In Pocket. I'd link but you can't get a link to a specific leaderboard, just to the whole thing. Anyway, because it's DLC and not in-game content, I'm sure I'll drop over time, it's just that people haven't bought it yet.
Three more sets and I can start helping people out with Riding on Coattails ... except ... except ... damn. You have to finish the Endless Setlist on Expert. crap.