The medieval Latin term choralis is derived from the Greek choros - choir and meant Church choir singing.
In Catholic music chorales were monophonic, i.e. they were used to singing in unison.
In the Protestant Church chorales steel polyphonic - usually a four-part.
Melody chorales differ exalted character. They are solemn, but sedentary - static aligned, sluggish rhythm. Harmony is sustained chord in the warehouse with a very strong voice-leading.
I. S. Bach. St. Matthew passion. 44. The chorale. Wer hat dich so geschlagen