Awesome stuff
I love the sound of this piece. I'll definitely be keeping an eye on your future work.
As for the Sages, it's pretty heavily implied that all the Sages are dead. It depends on your perspective.
-Saria went into the Forest Temple by herself and you go to save her. Yet you never see her through the whole place.
-Darunia goes into the Boos Room to fight with Volvagia yet there is no sign of him when you finally make it in there.
-Not entirely sure on Ruto. This one is a lot harder to determine.
-Impa goes into the Shadow Temple to confront Bongo Bongo. Yet you never see any sign of her when you go in there yourself.
-You actually see Nabooru get blasted by Koume and Kotake.
I don't think it's ever been made absolutely clear by Nintendo either way though.