It didn't ... it is still sung today, and quite popular in the Roman Catholic Mass Liturgies.
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.
The Middle Ages were around the time of Pope Gregory I from where Gregorian Chant gained its name
monophonic
Plainchant, Gregorian chant, monophonic chant, plainsong.
a gregorian chant was used as the base part for the motet and was called the cantus firmus
Gregorian chant
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.
yes
because it is.
Gregorian Chant