[sing-uh-lawng, -long] 
| 1. | an informal or unrehearsed singing of songs by a group of people, usually under the direction of a leader; songfest. |
| 2. | an occasion marked by such singing. |
| sing along | |
verb | |
| sing with a choir or an orchestra; "Every year the local orchestra and choir perform the 'Messiah' and the audience is invited to sing along" |