Yes, Rolf does sing a wonderful version of the Zeppelin classic, in his own inimitable style.Rolf's version came about as a result of his appearance on an Australian TV Game Show called The Money Or...
If you are talking about the song featuring Benny Goodman, that's jazz. If you're talking about the song written by Chris Tomlin, that's religious pop. If it's something else... I have no idea.