"1ce again: THE GREAT MOUSTACHES OF POPULAR MUSIC"
yes, this is a repeat post, possibly even the 4th time I've done it, but in a decade that's not too bad. And hell, it's been a while since a properly fun post on a Friday, and no, I still don't have any good ideas for 'serious' posts that wouldn't be of interest to me only. And moustaches really are THAT awesome, even though the ironic hipster moustache is so 2004 at this point.
It's a wonderful, follicular world of facial hair, especially upper-lip grooming, in the musical stratosphere. Link your favorites. Additional facial hair, such as sideburns, is acceptable, but full beards are the least desirable (though noone's going to kick you out of the post).
I start you off with two perennial favorites:
the great Neal Schon, formerly of Santana and later of Journey: