They generally have rhyming words and are in a strophic form (with the same melody being used for different verses). Within a verse, most chorales follow the AAB pattern of melody that is known as the German Bar form.
However, as early as 1524, Johann Walter published a book of these chorales arranged for four or five voice parts.
Often the harmonizations are taken from the final sections of cantatas by Johann Sebastian Bach. The melodies of the chorales were only in a few instances composed by Bach; the large majority of melodies were based on chorales that were already familiar to his congregation.
Bach's many chorale preludes are the best-known examples of the form. Later composers of the chorale prelude include Johannes Brahms and Max Reger.
Source: Wikipedia > Chorale
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