to harmonize the voices of those who sing (usually done by the maestro of the chapel)
Alonso de Molina:
cuica ana. nitla. (pret. onitlacuicaan.) concordar las bozes delos que cantan, el maestro de capilla, o entonarlos. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 26v. col. 1. Thanks to Joe Campbell for providing the transcription.