11.   And what about when the crowd sings along for the whole show?

12.   And they sing along, using the printed lyrics passed out at the door.

13.   Armed with a sheet of lyrics, students stand in their classrooms and sing along.

14.   As Mariah Carey songs blared from the public address system, campers cheered and sang along.

15.   As the eldest of the Clancy Brothers, Clancy toured the world singing Irish songs, often with thousands of audience members singing along.

16.   At Irving Plaza, an adoring crowd sang along whenever Finn offered them a chance, letting the tunes cushion his misgivings.

17.   At the end of the evening, most could not sing along in Hebrew to the Israeli national anthem.

18.   At a rehearsal at Ballet Theater earlier this month he stood by the piano, beating out the rhythm with his foot and singing along.

19.   A generation raised on arena-rock concerts may not think twice about singing along during a cabaret performance.

20.   All that clapping and singing along seems as natural as breathing.