As far as songs (with lyrics) go, my #1 would have to be A Gringo Like Me. Just evokes pure spaghetti throught ;D
Can't think of a whole 20 though, maybe 10 if I did some searching. Ringo Rides Again for sure, The Sabata theme, The Yankee Fellow (from Taste of Killing), are good examples. Anyone got any others?
Edit: the Captain Apache song as well, only reason I ever bother to put that one in