[quote name='Rocko']But I can't do pro keys ;-;
Like I thought with regular keys, there would be chunks of keys that corresponded to GRYBO, left to right. But in actuality there are 5 individual keys that are GRYBO left to right, and then there are also chunks, but they're out of order, so it doesn't lend itself well. I dunno.[/QUOTE]
The chunks are for pro keys so you know which section of notes you're supposed to be on. The tutorials for Pro Keys aren't that good since they're more about telling you things about keyboards in general (scales and all that), but not how you're supposed to actually play the songs in the game.
The normal difficulties are basically keytar mode while the pro keys are more challenging with ten possible notes, plus the sharps, that you have to keep track of, so it seems like there's a lot more practice needed to play those songs well even on easy.