In classical Greek music theory, one of the four perfect consonances or intervals, specifically the fourth (like from C to F).
From Greek 'fese' and 'parhypate' or related to Latin/Greek musical terminology. The term survives in historical studies of ancient music theory and medieval plainchant modes.
Fesapo is a ghost of ancient music theory—modes and interval names that Gregorian chants were built around, surviving mostly in academic texts about medieval church music rather than anywhere musicians actually use it today.
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