 Bach also wrote movements which have been described as chorale fantasias scored for various combinations of singers and instruments, for example the opening choruses of his chorale cantatas and the opening and closing movements of Part I of the St Matthew Passion.In the vocal pieces the chorale "cantus firmus" is often given to the soprano voice.In the 19th century the chorale fantasia was revived by Max Reger, who applied the term to monumental pieces based on chorale melodies.