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Definition of Plain-song
1. Noun. (music) The unisonous vocal music which has been used in the Christian church from its earliest centuries. ¹
2. Noun. (music) A cantus firmus or theme chosen for contrapuntal treatment; so called because often an actual fragment of plain-song. ¹
3. Noun. (music) The simple notes of an air, without ornament or variation; hence, a plain, unexaggerated statement. ¹
¹ Source: wiktionary.com