Here we have the song “Classico” from Tenacious D‘s The Pick of Destiny. I think you’ll find it an interesting listen. Unfortunately this is the only clean version I could find that didn’t involve annoying beeps, and there’s a bit of expositional scene at the beginning. If you want to skip it, let the movie load and then go to 1:39. Go ahead, do it. Don’t be a snob.
(If at any point this is showing up twice, gimme a bit and I’ll delete the extra, don’t worry. For some reason it didn’t show up the first time so I republished it, but it could be on a weird time delay.)