> So, I suspect this won't be a very satisfying answer...
Actually, that does make pretty good sense.
As it's almost impossible to truly rate difficulty, I guess if you limit the songs
to "just pop" (which is probably perfectly ok), then just a simple stab at
easy/medium/hard should be fine.
You may end up with some songs moving from medium to hard (and visa versa).
But, eh, that should be ok.
Ok, I'm good. My only request is to give us post 30 yr olds some good pop, too

"A Thousand Miles" is pretty decent. But I already learned it.