A choir composition is a piece of music written specifically for a choir to perform. It typically includes vocal parts for multiple SINGERS, and may also include accompaniment from instruments or other SINGERS. The term 'choir composition' can refer to any type of musical composition that is intended for a choir to perform, including classical, religious, and popular music. The crossword solution for the term 'choir composition' is 'SINGERS, ' which refers to the group of people who make up a choir and perform the composition.