Gregorian Chant

Gregorian chant is a form of plainsong that developed in Western Europe around the 6th century, traditionally associated with Pope Gregory I. It's typically sung by a choir without instruments, using modal scales and monophonic melodies based on liturgical texts. Pieces like 'Dies Irae' and 'Salve Regina' show how these chants work with prayers and psalms.

Some compositions have been attributed to specific figures over time, like the 'Missa de Angelis' mass setting sometimes credited to 15th-century monk Heinrich Isaac. The exact origins of many chants remain uncertain, but they've been part of Catholic liturgy for centuries.

While Gregorian chant has faced criticism for being repetitive or inaccessible due to its Latin texts, it continues to be performed and studied. The music's structure and vocal approach have influenced various forms of sacred and classical music long after its medieval origins.