Listen to Hummel: Mass in B-flat Major, Op.77: III. Credo online. Hummel: Mass in B-flat Major, Op.77: III. Credo is an English language song and is sung by Westchester Oratorio Choir, John Eric Floreen and New Brunswick Chamber Orchestra. Hummel: Mass in B-flat Major, Op.77: III. Credo, from the album Big Choral Box Vol III, Classical and Romantic, was released in the year 2016. The duration of the song is 7:00. Download English songs online from JioSaavn.