hmmm, subtle... ...but anyway, I sing everywhere, probably in front of the mirror sometimes, but not intentionally
I've never sang in front of a mirror, I'm not 100% sure why you would, you only really need to hear yourself anyway.....
I'm a drummer and I listen to mostly jam bands, so I dont really listen to lyrics or sing them that ofter. For me its just simply and purely about the musical exprience.