Despite it being a song from Portable Ops, as it was part of the iPod selection in MGS 4 I associate it with that game instead. I'm talking of course of the song Calling to the Night which, along with Snake Eater, definetly should be a part of this game. It's been so long since I played Brawl though, can't remember if either of them were in that game.
Also, call out to The Best is Yet to Come that just would never work as battle music, but is still pretty awesome.
I used to play Zelda a little bit at the start of Melee but since my friend started using Sheik, and only Sheik, to wipe the floor with me from one side of the screen to the next I've seen little of her, not really having an interest in using "his character" and him not having much interest in the Zelda part of the combo.
I'm not opposed to making them one unique, ninja princess but am more for the idea of splitting them up. Zelda in Skyward Sword doesn't really do much of anything compared to the OoT one the Smash character is based upon, though so I'm starting to be really curious how they will handle those two.