
Originally Posted by
brevity
You may be on (to) something.
Not that anyone asked for a theory, but I figure these rock singers had very strict upbringings. Maybe a young Mick Jagger would, say, act out in Catholic school, and the nuns would punish him by sealing his mouth with clothespins. Do that enough and you get an instant facial trademark. Years later Steven Tyler would suffer the same fate.
More recently, the thin-lipped Scott Weiland submitted himself to a collagen procedure because it was in his Rock Star Handbook and he lacks any originality.