Concordances based on RRMMA 34, 254; K and A in I-MOe MS {alpha}.M.1.13. The Credo has variants in the two sources; according to BURKHOLDER 1985, 502, probably the Milanese version is a late revision by Martini himself of the Ferrarese version (although for other masses the opposite has been more recently proposed: see STEIB 2014). According to LOCKWOOD 2009, 262, the full verse in I-MOe MS{alpha}.M.1.13 («Io ne tengo quanto te, d[']este frasche fronde») could allude to the ceremony for May Day at the Este court.