Sir Arnold Edward Trevor Bax KCVO (8 November 1883 – 3 October 1953) was an English composer, poet, and author. His prolific output includes songs, choral music, chamber pieces, and solo piano works, but he is best known for his orchestral music. While still a student at the Royal Academy of Music Bax became fascinated with Ireland and Celtic culture. In the years before the First World War he lived in Ireland and became a member of Dublin literary circles, writing fiction and verse under the pseudonym Dermot O'Byrne. In addition to a series of symphonic poems, he wrote seven symphonies and was for a time widely regarded as the leading British symphonist.