The Sanctus is a liturgical hymn in the Christian tradition, typically found in the Mass, that begins with the words 'Holy, Holy, Holy.' It is a proclamation of God's holiness and majesty. This term reflects the influence of sacred music during the Baroque period, where composers incorporated elaborate vocal techniques and instrumental accompaniment, establishing a strong connection between spirituality and musical expression that continued to evolve into the Classical and Romantic eras.
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