At age three, her mother took her to a concert, after which Joan requested a violin. When her mother realized she was serious, she obliged. Her first instructor was Karl Moldrem, the founder of the Baby Orchestra in Los Angeles. By age six, Staley had won by audition first chair/second violin in Peter Meremblum's Junior Symphony (André Previn was an alumnus). This led to her first film appearance, as a child violinist, in "The Emperor Waltz", starring Bing Crosby and Joan Fontaine.