a bit like British singers singing with an American accent which dominates almost all commercial music.

My daughter came home from school the other day singing a song she'd learned called "Nan was a Suffragette" - or, as she sang it, Naaan was a suhhf-ra-jaird... I told her she ought to sing about English subjects in an English accent, and she's never sung it in my hearing since. For her generation it's the voice you put on to sound like a singer - just like the BBC newsreader voice used to be the voice you put on to sound authoritative. I'll have to play her some Tony Capstick (maybe not the live album).