Anecdotally, I can tell you about two musician friends to whom I spoke yesterday, both of whom have lost someone close to them recently. Both spoke of the importance of singing in their lives, and how good it feels to sing in the midst of dealing with grief and loss.
I can tell you of the 250 people I saw singing together on stage last Saturday night and the obvious joy that being part of such an ensemble brought to them all (some of which is captured in this photo).
Christmas is on the way. There will be lots of opportunities to sing songs you know inside out in an informal environment. Maybe try it. See how it feels.