Call it the first important sibling musical. For the 1924 hit LADY, BE GOOD! had brothers George and Ira Gershwin collaborate on their first full score. Although the two had written a song in 1918, they hadn't since paid much professional attention to each other. In the interim, George's composing career had skyrocketed -- his name had graced 21 Broadway productions -- while Ira could "only" boast of nine.
SOURCE: Kritzerland at 11:21PM on January 29, 2015