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Emma Phipson has written:
'Choir stalls and their carvings' -- subject(s): Choir stalls, Church architecture, Wood-carving
'The animal-lore of Shakspeare's time' -- subject(s): Animals, Animals in literature, Folklore, Knowledge, Zoology
The collective noun choir is used for a choir of angels, a choir of singers, a choir of hummingbirds.
The possessive form of choir is choir's.
Choir of Joyful Hope
Jack volunteers his choir as the choir director.