The article focuses on Mass of the Americas , a tribute to Our Lady of the Immaculate Conception and Our Lady of Guadalupe in the form of sacred music. It mentions an alternation between Gregorian chant and polyphonic elaboration using the Kyrie cum jubilo for Masses of the Blessed Virgin. It also mentions that the composition set the tone for the whole liturgy, where music ranged from traditional Gregorian chants sung by a schola of either men or women.