George Gershwin composed "Lullaby" in 1919 as a class assignment during his studies in classical music theory. Initially conceived at the piano, the piece was subsequently arranged for string quartet and became a favorite at private gatherings among Gershwin's friends. The melody later reappeared as an aria in his 1922 opera "Blue Monday."
The original string quartet version of "Lullaby" did not receive a public performance until 1967, when the Juilliard String Quartet presented it at the Library of Congress. Since then, the piece has occasionally been performed in this string orchestra arrangement, showcasing its adaptability and enduring appeal.

"Lullaby" is characterized by its gentle, soothing melody and rich harmonies, reflecting Gershwin's early exploration into classical forms while maintaining his distinctive melodic style. The composition's serene quality and melodic charm have contributed to its lasting presence in both chamber and orchestral repertoires.