The Proclaimers - caused quite a stir when they first surfaced as few (in pop and rock music anyway) had sung in such broad Scottish accents. After first seeing them on ‘The Tube’ I loved them immediately, instantly recognisable and with great songs too.
Some music genres seem to suit regional accents more than others - obviously folk being one of them. I can’t imagine Kate Rusby or say The Unthanks using anything other than their own accents. Rock n roll, being thought of as primarily American in origin, means that most people covering it usually adopt a transatlantic style of phrasing. Not sure whether this is really correct, but after many years few question it being done.