Other forms: chorals
When a large, organized group sings together, the music can be described as choral. Singing the choral piece "Messiah" by Handel is an annual tradition for many people who celebrate Christmas.
The adjective choral is used for music that's sung by a choir or chorus — or written for voices, rather than instruments. It also describes anything connected to that kind of singing, like choral groups, choral concerts, and choral scholars who major in music at college. The word comes from the Greek khoros, which means "dance," but implies some singing too.