Final answer:
Johann Sebastian Bach's Mass in B minor, completed in 1749, is an important sacred choral work and one of his last major compositions. It embodies his Lutheran faith and showcases his skill in counterpoint and harmony.
Step-by-step explanation:
Johann Sebastian Bach's Mass in B minor is an immensely significant choral work completed in 1749. This sacred composition is revered not only for its musical complexity but also for its spiritual depth. Comprising a series of movements that traverse a wide range of musical styles, Bach’s Mass is regarded as one of his supreme achievements and a monumental work in the Western classical music tradition. The piece was one of Bach's last major compositions and is an example of his deep Lutheran faith, as well as his mastery of counterpoint and harmony.