If I was there, I wouldn't join in, Dougie, but I'd be an addition to the appreciative audience.
It's reminded me of a comment I read, recently.
said she was feeling a bit bah-humbug! and readers added comments of their own to try to help dispel this.
Someone said: "there is nothing better than the JOY of all the Christmas concerts in which I'm involved. Singing (and music-making) is an incredible method of community building and then to turn around and share that gift with the community at large is amazing!"