“they all refer to these people as musicians...”

"They" could just as well refer to these people as ducks. It still wouldn't make them ducks.

“...It's definitely part of the language now ...”

No, actually it is colloquial, not really part of the language.

“the people who count say they're musicians so they're musicians...”

Just who are 'the people who count'? Some Millennial cretins writing blogs from their mom's basement? grin

You're free to define it any way you choose, Bob. I just disagree.


Regards,

Bob