So many fabulous Gershwin songs. The very first one that popped to mind when I read the topic of the day was "They Can't Take That Away from Me."
Among the others I really love: "Liza," "Fascinating Rhythm," "Someone to Watch Over Me," "Of Thee I Sing," "I Got Rhythm."
All of Ira's work in LADY IN THE DARK and A STAR IS BORN is inspired. I particularly love "The Man That Got Away" and "Girl of the Moment."