One of the strangest of Zacara's songs, occurring in the Mancini Codex, is "Deus deorum, Pluto", a two-voice invocation to the Roman god of the underworld; the text is filled with the names of the inhabitants of the infernal regions. It is "an enthusiastic prayer to Pluto, king of the demons"—not the kind of composition one would normally expect from a pious Vatican secretary. Zacara even used this song as a basis for one of his settings of the Credo of the mass.