found: His Cherry leaf rag, c1909:cover (by El Cota)
found: Grainger.de WWW site, Feb. 22, 2011:Music; Composers (El Cota; American xylophone player from Calif.; billed as "The world's greatest xylophone player")
found: Continuum encyc. of pop. music of the world Db, Feb. 22, 2011:Part 3, Musical instrument; Percussion instruments; Xylophone (vaudeville xylophonist William Coates ('El Cota'))
found: Sutton, A. Pseudonyms on Amer. records, 1892-1942, 2nd ed.:p. 348 (Cota, El = Lawrence Albert Coates)
