I grew up in the 80s, listening to hard rock and heavy metal. Yes, the hairly-glam metals. Maybe it is a nice attempt to look into their hair aspects – they are mocked as "hair metals" because they all looked alike, but as in any subculture genre, if you look closer there are real differences worth a Wikipedia entry. Or at least an honorable mention (Good Try) in deletionpedia.
This is the golden example. It worked for anybody. The most notorious example is, of course Bon Jovi.
Some of the variations worked. Slash (Guns & Roses)
And some did not. Phil Lynott (Thin Lizzy)
Straight hair worked best if they were already good-looking.
Straight blond: Bret Michaels (Poison)
Straight black: Nuno Bettencourt (Extreme)
They were anomalies…trying true to be themselves but almost never had a great result.
Should be the end of the world for rockers, especially if they are frontmen…no worry, they had a trick. The hat.
Or sometimes baldies decided to remain baldies. Rob Halford (Judas Priest)