Have you ever listened to a Keith Jarrett concert?
If you don't know him, he's a jazz piano legend (also plays beautiful classical), famous for coming onto stage without a plan and just improvising for an hour or so. His improv is among the most impressive and beautiful you can imagine.
But he's also famous for being extremely vocal as he does it, you can hear in almost every recording when he starts yelling or singing along with his own improvised melodies, in pure joy and ecstasy of whatever it is he's doing - it's become a signature sound of his music.
God what I would have given to be at one of those concerts. He had a stroke and lost use in one arm so... never again.
(I don't expect you to actually listen to a 30 minute video (1 of 4 parts), but it's essential listening! The best selling piano record in history)