G.M.Trabaci (Ricercate, ... Libro1)26,27

Gagliarda Prima -> Mensuration sign is IMPERFECTUM MAUOR = 3 Minims × 2

Gagliarda Seconda -> Mensuration sign is PERFECTUM MINOR = 3 Semibrevis

http://aeolianconsort.chakin.com/Trabaci.htm#Ricercate_Libro1-23