"Quoniam, tu solus sanctus.
One part of this piece includes a fugue for six voices to represent the six-winged seraphim described in Isaiah 6:1. This piece's only music for horn is a solo accompanying the bass aria "Quoniam, tu solus sanctus." This piece represents the unity of substance of Christ and God the Father in its duet "Et in unum dominem." It repeats the music of its "Gratias agimus tibi" movement in its final movement, a setting of the "Dona nobis pacem." Its central movement repeats the lament "Crucifixus," and appears as the fifth of its nine movements setting the Nicene Creed. The last major choral work of its composer, it was given the BWV number 232, and begins with a Kyrie and a Gloria first composed for a Lutheran missa brevis in 1733. For 10 points, name this setting of the complete Roman Catholic Mass by J. S. Bach.
One part of this piece includes a fugue for six voices to represent the six-winged seraphim described in Isaiah 6:1.
Mass in B Minor [or BWV 232 before mentioned; prompt on Johann Sebastian Bach's Mass or anything that doesn't make clear it's the Mass in B minor]