Ex-Megadeth's Glen Drover recorded a Jean-Luc Ponty piece and two Zappa pieces on his "Metalusion" album. ('The Purple Lagoon' & 'Filthy Habits')
added info: the album contains 10 pieces, 5 of them are cover tunes. Actually there
are 2 Ponty coverversions: "Don't let the world pass you by" and "Mirage". And there's also a coverversion of Al Di Meola's "Egyptian Danza".
--info (& added info): Harald Haering