i would have to say "Bohemeian Rhaspody" by Queen. freddie mercury's vocals throughout the entire song are awesome, and the whole choir-arrangement thing he does is equally awesome. this song starts out a quiet ballad , then rolls into an a very upbeat and driving middle, then snowballs its way to hard rock with a brian may driven guitar solo, and in its final moments degresses its way into a ballad, just as it begun.