Orchestra was commissioned by Stock; Nikolai Myaskovsky, whose Symphony No. 21 was commissioned for the orchestra's 50th anniversary; Josef Suk; William Walton; Arthur Benjamin; George Enescu; and many others. Stock and the Chicago Symphony debuted the Symphony in E minor by Florence Price on June 15, 1933, Price's first symphony and the first composition by an African-American woman to be played by a major orchestra. Stock's most memorable recordings were of Romantic repertory by Schubert, Schumann, Weber, Goldmark and Glazunov. In 1936, when Stock was less and less able to conduct himself, Hans Lange, formerly Arturo Toscanini's assistant with the New York Philharmonic, was hired to conduct those CSO concerts Stock could no longer conduct. He remained at the CSO during Désiré Defauw's tenure, and was a mentor of Chicago composer Leon Stein. Stock died in Chicago on 20 October 1942. Recorded legacy In May 1916, the Chicago Symphony Orchestra, under Stock's baton, made its first set of recordings for the Columbia Graphophone Company label in Chicago (the specific location is not documented); the first piece recorded on May 1, 1916, was the Wedding March from Felix Mendelssohn's Incidental Music for A Midsummer Night's Dream. The orchestra later made its first electrical recordings for the Victor Talking Machine Company in December 1925, including superbly idiomatic performances of Karl Goldmark's In Springtime overture and Robert Schumann's First ("Spring") Symphony; these early recordings were made in Victor's Chicago studios and within a couple of years the orchestra was recorded in Orchestra Hall, its home. Abandoning recording for several years after 1930, the CSO then returned to Columbia for a long series of recordings, only to finally return to RCA Victor in 1941-1942 for its final series of recordings under Stock, whose last studio recording, Ernest Chausson's Symphony in B-flat, was released posthumously in 1943. Stock's 37-year tenure as head of the Chicago Symphony Orchestra was surpassed in the United States only by Eugene Ormandy's 42 years as music director of the Philadelphia Orchestra. After Stock's death in 1942, Désiré Defauw was chosen as his successor. Notable recordings Johann Sebastian Bach: Suite No. 2 in B minor, BWV 1067 (Ernst Liegl, flute [appointed CSO principal flute in 1928] (December 1927, Victor) Johann Sebastian Bach: St. Anne Prelude and Fugue in E-flat major, BWV 552 (arr. Frederick Stock) (December 1941, RCA Victor) Ludwig van Beethoven: Piano Concertos Nos. 4 & 5 "Emperor" (with Artur