As his Coolidge Medal (1942) indicates, William Kroll greatly contributed to music during his day, both like a soloist so that as a member of varied intimate chamber ensembles. Among enough time he was students of Marteau on the Berlin Hochschule für Musik (1911 – 1914) and enough time he was a pupil of Franz Kneisel and P. Goetschius on the Institute of Musical Artwork (1917 – 1922), he produced his professional debut in NY (1915). After completing his schooling, he toured elements of European countries and North and Central America being a soloist and an associate from the Elshuco Trio (1922 – 1929), the Coolidge Quartet (1936 – 1944), as well as the Kroll Quartet (1944 – 1969). Amid his performance plan, he trained at various services, first on the Institute of Musical Artwork (1922 – 1938), after that on the Mannes University (1943), the Peabody Conservatory (1947 – 1965), Tanglewood (by 1949), the Cleveland Institute (1964 – 1967), and in addition at Queens University (from 1969). His structure entitled Banjo and Fiddle for violin & piano, continues to be recorded for most major brands — double for EMI.