I happened to come across this video through the Zelda Universe. This is (what I think) a fantastic version of Lost Woods/Saria's Song from the Ocarina of Time. For the musically minded the video also contains what bars are being played, which is a nice addition for those concerned. If you have fond memories of OoT please have a look at this, it sounds fantastic and you won't regret it.

From Youtube:

"Turn your Guitar Hero controller into a synth instrument! It's not as hard as you might think. And your old friend Powerglove will show you how!"