They don't just stand and sing, they dance, they mug, they perform, they clown, they kibbitz.
From the blogs.psychcentral.com
The front porch is a few paces from McGill's desk, so she can hop down to announce bills and hop up to kibbitz.
From the omaha.com
An old white geezer and the town's resident old black geezer sit on a bench and kibbitz like Muppets Statler and Waldorf.
From the cnn.com
Sure, the players kibbitz on the range and give one another the needle, but once the tournament starts it's every man for himself.
From the jsonline.com
Rather than kibbitz with a number two, Bezos actually reads over-the-transom e-mail, which most CEOs regard as unbearable clutter.
From the forbes.com
More examples
Kibitz: make unwanted and intrusive comments
Alternative spelling of kibitz
To offer unsolicited advice as a spectator
Kib-bits) to butt in, to mind other people's business, to watch over the shoulder of those playing cards and put your two cents in. Not to be confused with kibbutz (kib-bootz), which is a collective farm in Israel.