Game musician Dinnick the 3rd has created a lovely little cover of the Cape Claw theme from Star Fox Adventures. It features guitar, xylophone, and even an ocarina. For the chorus, he created new lyrics.
What does this song have to do with Krystal? Great question. Turns out, Krystal's theme makes up part of this song. Plus, it's just really really good!
You can listen to the whole album, and purchase it for whatever price you think is fair, on the Album Bandcamp Page.
There are other Star Fox works he's done. There's this awesome Corneria Cover from the classic Star Fox for the SNES. Then you can sample his electronic cover of Swapstone Hollow from the unreleased Dinosaur Planet.