A hymn of the Lutheran church, usually written for four voice harmony. Many chorales were written by J. S. Bach, which serve as a basis for the rules of partwriting. The melody is usually in the top voice, with supporting harmony in the lower voices.a chorale is a German Lutheran hymn-tune, a number of which were composed or arranged by Luther himself and adapted in later centuries to various harmonies, the most famous of all by Johann Sebastian Bach. The word is also used in America to signify a choir or chorus