I don't think Donny is talking about not being able to play and sing at the same time. Most of us can do that.

A friend, years ago, said to me you can't be a great vocalist and a great keyboard player (and working pedals too) "at the same time." I puzzled over that for years, and finally I realized what he meant. He meant you can't be a "GREAT" vocalist and a "GREAT" keyboard player "at the same time."

You pick one and go with it. When I'm playing just music I can improvise great arrangements. But when I'm singing and need to stylize the song rather than just sing words, my "great arrangements" go to the bottom of the deck.

One either plays good background while spitting out the words to a song, or you sing like Josh Groban and bang out chords and a few fills behind yourself.

Mark