I know theres a few version of Sabre Dance, I cant remember the composers name, something russian, none of which I particularly like. They usually end up as self-indulgent noodling, pity cos its such a great song.

House Of The Rising Sun Im sure is an old blues/pre-blues black song, "Down in New Orleans...", if it was Irish Im sure Id know about it.

Muse also drew from Bach's Toccato en Fugue in D Minor for the intro riff to Plug In Baby, very good song btw