George Sainton Kaye Butterworth:Biography with photograph, explanatory notes, details of his life, military service, and music, listening tips, links to related subjects and people, supporting material, and works list.
Butterworth, George: Brief biography and works list from the Gilder-MusicWeb Dictionary of Composers.
Butterworth, George Sainton Kaye: Biography with education, Vaughn Williams association, and representative work from the Grove Concise Dictionary of Music entry at WQXR radio.
George Butterworth: Brief life, comments on his music, and links from the Classical Composers Database.
George Butterworth (1885-1916): Catalogue of art songs from recmusic.org includes cycles and individual pieces, all linked to their texts.