The songs in the Squarcialupi Codex and Mancini Codex differ greatly in style. Those in the former document were probably written early in Zacara's career, and show influence from lyrical mid-century Italian composers such as Landini; the music in the Mancini Codex is more closely related to the mannerist style of the "ars subtilior". While exact dates on the music have not been established, it is possible that some of the music in the Mancini Codex was written after Zacara left Rome, and was more likely to be influenced by the Avignon-based avant-garde "ars subtilior" style; on the other hand he may have been consciously trying to create a Roman response to the music coming from the court of the schismatic antipopes.