Listen to Petite messe solennelle: Credo in unum Deo online. Petite messe solennelle: Credo in unum Deo is a Latin language song and is sung by Lucia Popp, Brigitte Fassbaender, Nicolai Gedda, Dimitri Kavrakos, Katia Labèque, Stephen Cleobury, Marielle Labèque and David Briggs. Petite messe solennelle: Credo in unum Deo, from the album Rossini: Stabat Mater - Petite Messe Solennelle, was released in the year 2005. The duration of the song is 4:22. Download Latin songs online from JioSaavn.