not my subjects. But seeing answers was quite good.

Got the Diamond & Prince groups fairly quickly, The other 2 not so.
Very good grid

I agree - great grid

didn't score a point till connections grouped

Wishing more grids were like this one.
Only put in "musicians" for the second one but it was accepted. Nice to see some gridders actually thinking about the different ways players will phrase their connection and not egotistically sticking to the connection they (the submitter) have in their head.

Technical term is mononymous. Good grid.

I though Pink had an upside down exclamation mark instead of an i.

An upside down exclamation mark is an i - I think you meant an exclamation mark. Classic example of McKean's law there.