found: Keyboard wizards of the Gershwin era [v. 6] [SR] p1998:container (Muriel Pollock) insert (pianist, composer; married Will Donaldson)
found: Hixon, D.L. Women in music, 2nd ed.(Pollock (Pollack), Muriel (Molly Donaldson); b. Jan. 21, 1904, d. May 24, 1971, Los Angeles; Amer. organist, pianist, composer)
found: Morath, Max. The ragtime women, 1994?, ℗1977:insert (Muriel Pollock; born 1895, Kingsbridge, New York, died 1971)
found: Wikipedia, August 29, 2019(Muriel Pollock; born January 21, 1895, Kingsbridge, New York, died May 25, 1971, Los Angeles, California; American songwriter, composer, pianist, and organist; other names: Muriel Pollock Groll; Muriel Pollock Donaldson; Muriel Pollack; Molly Donaldson)
found: FamilySearch.org, August 29, 2019:United States Census, 1920; New Jersey; Bergen County; Closter borough; enumeraton district no. 11 (Pollock, Muriel; born New York; age 23 as of January 3; composer) California Death Index, 1940-1997 (Muriel P. Donaldson; born January 21, 1895, New York, died May 25, 1971, Los Angeles)