) On the basis of the original Gregorian chant music, polyphonic settings have been composed by Anton Bruckner, Pablo Casals, Maurice Duruflé, Grzegorz Gerwazy Gorczycki, no:Ola Gjeilo, José Maurício Nunes Garcia, and Nikolaus Schapfl,
What type of  melodic, rhythmic, and harmonic changes have been made by composers but are based on the works that are monophonic and  unaccompanied sacred song?
polyphonic settings have been composed