Gregorian chant
noun
mass noun
- church music sung as a single vocal line in free rhythm and a restricted scale (plainsong), in a style developed for the medieval Latin liturgy格列高利圣咏（具有天主教拉丁语礼拜仪式的风格的宗教歌曲, 为单声线、节奏自由、音阶有限的素歌）。
词源
mid 18th cent.: named after St Gregory the Great （in Latin Gregorius）， who is said to have standardized it.