0 a musical note with a time value equal to two or three breves:
In modern notation, a longa is usually represented as semibreves tied across two measures.
There were notes that were longer than the breve, which were called "longa" and "maxima".
The strokes called plica are still applied to longae and breves.
The longa sometimes contained three breves, in which case it was called perfect, and sometimes only two, when it is said to be imperfect.
