Peter Warlock's monograph on Delius (John Lane, The Bodley Head, London, 1923, revised edition 1952, pp. 31–2) quotes Delius's childhood reminiscences. They include this significant passage:

My first great musical impression was hearing the posthumous Valse of Chopin which a friend of my father's played for me when I was ten years old. It made an extraordinary impression on me … I remember that after hearing it twice I could play the whole piece through from memory.