Dictionary![]() ![]() plain•songPronunciation: (plān'sông", -song"), [key] —n. 1. the unisonous vocal music used in the Christian church from the earliest times. 2. modal liturgical music; Gregorian chant. 3. a cantus firmus or theme chosen for contrapuntal development. 4. any simple and unadorned melody or air. Also,plain' song".Also called plainchant (for defs. 1, 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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