because it is.
Gregorian chant is beautiful and prayerful music.
'Polyphony' does not describe Gregorian chant.
Gregorian chant or Plaint chant is known as monophony. Many voices, unaccompanied, and all singing in unison.
monophonic
Plainchant, Gregorian chant, monophonic chant, plainsong.
Gregorian chant
a gregorian chant was used as the base part for the motet and was called the cantus firmus
nope. Gregorian chant is the central tradition of Western plainchant, a form of monophonic liturgical chant of Western Christianity that accompanied the celebration of Mass and other ritual services.
Gregorian Chant
no
Gregorian chant
stepwise within a narrow range of pitches.