different between plainsong vs parallelorganum

English

plain +? song, calque of Latin cantus planus.

plainsong (countable and uncountable, plural plainsongs)

(music) A form of monophonic chant in unison using the Gregorian scale, sung in various Christian churches.
Synonym: plainchant
(music) A cantus firmus or theme chosen for contrapuntal treatment; so called because often an actual fragment of plain-song.
(music) The simple notes of an air, without ornament or variation.
(by extension) A plain unvarnished statement, without exaggeration.

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