Parallel 5ths are forbidden in Baroque music and Classical music. However, plainsong accompaniment has its own rules and modal style. The great masters sometimes even wrote parallel sevenths! Instances of parallel fifths are too numerous to list in the Nova Organi Harmonia by the LEMMENSINSTITUUT. For example, consider this one. But one must possess a certain expertise to employ them properly. By the way, if you wish to see double parallel fifths, click here.
Parallel Fifths In Plainsong Accompaniment?
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