Known as the “Father of the Symphony” and considered one of the legendary “Viennese Classical Trinity” alongside his friend Mozart and his pupil Beethoven, Joseph Haydn is one of the most prominent and important composers of Viennese classicism. After his promotion to Kapellmeister at the Esterházy court, Haydn began composing his most extensive sacred work, the monumental Missa Cellensis in honorem Beatissimæ Virginis Mariæ (Mass for Mariazell in honour of the Blessed Virgin Mary), rising to take its place alongside the most notable and important liturgical compositions of the Viennese tradition.