As much as the lists posted by you guys are correct, I couldn't believe that you forgot to add Rainbow Rainbow [h] (that's like the first level 10 song that I've hard cleared).
P.S.
I also kinda agree on Crossroad [a] in that it's relatively easy to hard clear (though I get mixed results when I turn random on). Must be my ability to adapt to more complex chord patterns is not yet as solid as I thought..........
__________________  |