Lots and lots of pressure from the environment and society creates differences in our species.
'Race' isn't really a thing - Negroid, Mongoloid, Caucasoid are all oversimplified genetics.
Weather, living condition, amount of sunlight, diet, social preferences contributes to our different...
Culture is a far greater influence than what you look like.
I grew up in a heavily multilingual environment and my parents are multilingual as well. Ever since I was a kid, all I wanted to do was learn everybody's language in the neighborhood (Fukien next door, mandarin down the block...
Yes, you would need to ask permission from the band - you get it by contacting their manager or the band itself and talk about it. Anyway, if you are writing a docu-biographical screenplay, you would need to interview the band members themselves and their family for an accurate data - websites...