A minor but lovely piece that ought to be included is Reynaldo Hahn's 'Bal de Beatrice d'Este" (I may have left out an article or adjective.)

Anecdote: When Ottarino Resphigi was starting his career, he was torn between the priesthood, composing, or being a concert violinist. As a result his first major work was 'Concerto Gregoriano', a violin suite based on gregorian themes. It's worth a listen.