The whole reason the song was changed was most likely because Lucas wanted to show off some CGI with Joh Yowza and the new Sy Snootles. While they’re impressive CGI creations in themselves, they don’t belong in a 1983 film (The Hensonesque puppets/muppets and costumes belong in that era), and neither does Jedi Rocks, which as mentioned before, isn’t even John Williams’ work.

I also (as I started a thread on its own about) can’t stand the way the RTJ soundtrack album also has those songs replaced. If you’re going to include alternate versions of tracks (Sail Barge Assault) that weren’t ever in the film, why not include material that “once was”?