from the early 1930s weinstock had been a friend, champion, and chronicler of the mexican composer carlos chávez. he wrote a lengthy analysis of his music for "the musical quarterly" in 1936 and translated his "hacia una nueva música: ensayo sobre música y electricidad" into english for publication by norton in 1937. he also wrote the notes to a series of concerts given by chávez at new york's museum of modern art in 1940 and the biography for the catalogue of chávez works published by the pan american union in 1944.