Cantus firmus

Definition and stakes

J. H. Kurtz,  Church History (Volumes 1-3)

“ But, on the other hand, the chorale singing may be regarded as a renewal of the old cantus firmus, while at the same time it sets aside the secular music style and the artificialities of counterpoint and the elaborate ornamentation with which the false taste of the Middle Ages had overlaid it. The congregation sang the cantus firmus or melody in unison, the singers in the choir gave it the accompaniment of a harmony. The organ during the Reformation age was used for support, and accompanied only in elaborate, high-class music. ”
Source: Gutenberg

Portrait of André Pirro André Pirro,  Johann Sebastian Bach: The Organist and His Works for the Organ

“ The cantus firmus is sustained by the tenor, almost without elaboration, supported by rich polyphonic imitations of these various motives.
In the same style of composition, born of a poetic imagination, is the chorale-prelude Schmücke dich, O liebe Seele.
"Schmücke dich, O liebe Seele!" Adorn thyself, O dear soul; be full of virtue, to please God; yet, however pure, may thy virtue be-65- natural and effortless! Be full of grace, and may thy virtue be a very beautiful thing; doubtless thou hast never sinned, and thus there is no question of repentance ...
”
Source: Gutenberg

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