Correct me if I'm wrong but I believe that this was the first ever recorded instance of "Fuzz Tone." Marty's bass player blew a speaker and Marty liked it, so it stayed. I haven't filtered my fallible old Irish memory through Snopes.com but this is how I remember it. It starts at about 1:25 in.

https://www.youtube.com/watch?v=QVTKeVhN1Bc

Mac, Bob, or Mario may blow me outta the water.