This is not your ordinary choir! Each of the four angels (sold separately) in this choir moves in time to the two songs that each sings individually. When put together with other members of the choir, they communicate along with each others songs. As with other holiday traditions, "The more the merrier!" Put the four choir members together and enjoy all eight songs! Michael sings: "Joy to the World" and "Silent Night." Requires three (3) AAA batteries (included).