George Gershwin was unique among Tin Pan Alley composters in that he

Question $3$ options:

was Jewish, which was rare for Tin Pan Alley writers, as the entertainment industry was exceptionally rife with antisemitism.

made heavy use of Latin American influences in his music.

sought and achieved success in the world of concert music as well as popular music.

was the most prolific and consistent among them, with an active songwriting career spanning almost $60$ years.