The musical trope Quem queritis ("Whom do you seek?") played an important role in what event or process?

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Quem queritis was a musical trope used in the Easter liturgy in the early medieval Church, which portrayed the encounter between the Three Marys and the Angel at the tomb of Christ. This musical trope is considered to be one of the earliest examples of liturgical drama and the origins of the medieval mystery plays.

The Musical Trope Quem Queritis ("Whom Do You Seek?") Played