Sorry to bust your bubble, Mike. But, the term "mustache rock" is already spoken for. Here are some references:

http://www.popstrology.com/lookup_mustacherock.html

http://www.mulletsgalore.com/other/vocabulary/index.html

That's not to say you shouldn't fight for the rights to the name, because personally I'd love to see WE in an outright cage match with the dudes from Grand Funk Railroad. I think you can take 'em!