Singing together as a member of a choir or organized group of singers.
From 'choir' (from Old French 'quer', Latin 'chorus') + '-ing' gerund suffix. The word evolved from choral performance in medieval churches to any organized singing group.
Medieval choirs literally shaped how we sing—their four-part harmonies became the foundation for all Western music, and the physical space of church choirs (separated into stalls) is why we still call them 'choir lofts' today.
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