The Grecian tragedy was at first nothing but a chorus of singers.
Dryden.
2. (Gr. Drama) A company of persons supposed to behold what passed in the acts of a tragedy, and to sing the sentiments which the events suggested in couplets or verses between the acts; also, that which was thus sung by the chorus.
What the lofty, grave tragedians taught
In chorus or iambic.
Milton.