One of the mysteries of the English language finally explained.
Attributive Of or designating a style of church music influenced by traditional folk music and typically performed by a choir with an accompanying band. Also: (of a musician or group) that performs such music, often from the west gallery of a church.
Late 19th century; earliest use found in Harper's Magazine. From west + gallery.
west gallery/ˌwɛs(t) ˈɡal(ə)ri/
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