chorus

any utterance produced simultaneously by a group; "a chorus of boos"

a group of people assembled to sing together

the part of a song where a soloist is joined by a group of singers

a body of dancers or singers who perform together

a company of actors who comment (by speaking or singing in unison) on the action in a classical Greek play

utter in unison; "`yes,' the children chorused"

sing in a choir