'If ever' there will be a point in my life where I would have to stop playing this game, then I'd probably say:
1) Homesick Pt. 2 & 3 extreme (only a less than 10 misses away)
2) The song with "TION" in the title extreme (I'm happy that I can get at least 10 million plus score on it; but if I can FC this, then the better
)
3) Timepiece Phase II extreme (but for short term goal, I want to pass it without danger)
Of course, there are more but the OP only asked for three songs so...there you have it.