Personally it goes:
The Legendary Beast
The Extreme
.
.
.
Maybe I'm A Lion
If you look at the number of Likes on YT you see what I've always known - the greatest theme gets the least appreciation. Normal Griever looked ten times more awesome and had a much better theme but The Legendary Beast always gets shortchanged. WHY????
I can only assume it's because some dumbass had the bright idea of having Premonition continue to play until Griever uses Shockwave Pulsar. And since this game is absurdly easy, he's probably only gonna use the move when you've killed him. So the average player only heard the first 30 seconds of the song before he dies.