An amateur concert of an informal nature; a convivial meeting where each person is expected to contribute a song. Now more usually a gathering for…

An act of singing; the power of singing. Also, a hearty sing-song or round of collective singing (chiefly U.S.).

With a and plural. An instance of this. Now North American (chiefly Southern), a gathering joined for collective singing, esp. at a church; a hearty…

a musical performance in which the audience participates in the singing.

A sing-song to the accompaniment of a song-leader or tune.