Artur Rodziński, Conductor of the New York Philharmonic, saw Fabray's performance in Meet the People and offered to sponsor operatic vocal training for her at the Juilliard School. She studied opera at Juilliard with Lucia Dunham during the latter half of 1941 while performing in her first Broadway musical, Cole Porter's Let's Face It!, with Danny Kaye and Eve Arden. She decided that studying during the day and performing at night was too much for her and took away from her active social nightlife which she so enjoyed, and that she preferred performing in musical theatre over opera and thus withdrew from the school after approximately five months. She became a successful musical theatre Actress in New York during the 1940s and early 1950s, starring in such productions as By Jupiter (1942), My Dear Public (1943), Jackpot (1944), Bloomer Girl (1946), High Button Shoes (1947), Arms and the Girl (1950), and Make a Wish (1951). In 1949, she won the Tony Award for Best Actress in a Musical for her portrayal of Susan Cooper in the Kurt Weill/Alan Jay Lerner musical Love Life. She received a Tony nomination for her role as Nell Henderson in 1963 for Mr. President 1963 after an eleven-year absence from the New York stage. Fabray continued to tour in musicals for many years, appearing in such shows as Wonderful Town and No, No, Nanette.