Ok, so the surprise is way on track, the music is just absolutely awesome. And it's made me so awesome I'm just going to reveal all the letters right now (You still have to unscramble them).
Anyway the letters are, in no particular order, hpkoasswegoiirn
I'll reveal a little more when ever someone unscrambles it. Or I will give a hint if it takes a little to long. Good luck.