found: McCormack, J. John McCormack recital [SR] 197-:container (Edwin Schneider, piano)
found: Pierre Key's musical who's who, 1931(Schneider, Edwin; b. May 20, 1874, Chicago; accompanist)
found: Bantock, G. Desolation, 19--:label (E. Schneider)
found: Count John McCormack, c1988:p. 36 (Edwin Schneider, 1874-1954 [death date is erroneous])
found: The rose of Tralee, 1930(Edwin Schneider [entered as composer, but actually the arranger])
found: Buehrmann, Elizabeth. Photographic portraits of artists, writers, musicians, arts administrators and patrons of the arts, ca. 1904-1917, and photographic illustrations and accompanying tearsheets for magazine and newspaper advertisements, ca. 1917-1921, 1904-19212 photographs, viewed in New York Public Library Digital Collections, October 22, 2020: photograph showing subject with hands folded; inscribed on verso: ("Ted Schneider, accompanist to Gradski, and then to John McCormack (1884-1945)"); photograph showing same subject with etching plate in hand; inscribed on verso: ("Ted Schneider, etcher; locale: Chicago") - https://digitalcollections.nypl.org/items/3a5c3880-7f92-0135-3350-4dd972aaa434 - https://digitalcollections.nypl.org/items/3b2d2700-7f92-0135-02c8-07d836fed8ac
found: McCormack, John. John McCormack: his own life story, c1918, via Google Books, October 22, 2020:page 333 ("This [1914] was Edwin Schneider's first complete season with the tenor as accompanist") page 403 ("Ted" is McCormack's name for Schneider) page 407 (Schneider quoted: "I have played for no one else since that spring of Nineteen Thirteen")
found: Goldberg, Albert. "The sounding board," in the Los Angeles times, December 15, 1957, via Newspapers.com, October 22, 2020 (interview with Schneider: "Edwin Schneider, for 27 years John McCormac's accompanist, recalls memories of great tenor"; Schneider "had been ill for some time and was in a convalescent home in Anaheim" at the time of the interview)
found: California Death Index, 1940-1997, via Ancestry Library Edition, October 22, 2020(Edwin Schneider; male; birth date: 20 May 1874; birthplace: Illinois; death date: 12 Apr 1958; death place: Orange)