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Thank you! aaaaand you sir are 100% correct, completely agree, in fact I had some plans very similar to what  you're describing.  Like triples for example -in fact I had a bpm and measure system that would let you switch between 4/4 and 3/4 (and speed) so waves would happen like 'duh duh duh pause duh duh duh pause duh duh duh duh duuuuuh' (think metal music lol) and you would need the right rhythm to succeed.  Plus special moves that you could buy for the band and equip before levels so you could swap sheet music.  I had this partially implemented (you can see 5 buttons where the pause/play buttons are now on one of my latest twitter posts if you're curious, was gonna have them let you switch on the fly for exactly that ) buuuuut by the last day i had to comment out a bunch of stuff like that and panic to get everything done last minute for the jam xD   but gotta say I had not considered combinations and that's an awesome idea I may have to throw in!  Thanks again man!