Getting back to the topic at hand..

I feel a distinction between "happy" and "joyful." "Happy is like chinese food... wonderful for the moment, but doesn't last long enough. Ephemeral. Now, Joyfulness... that's another deal entirely. Think of the use of the words. You can get a Happy
Meal at McDonald's. Then think of The Ode To Joy. "Fulfilled" is on a different plane, too. Some things make me happy AND joyful and are fulfilling. Most likely, it involves someone else's joy and happiness as well.

Bringing music to old folks and the sick and shut-in is all three, for me.

Jerry