Final answer:
George Gershwin was featured on the cover of Time Magazine because of the cultural significance and enduring popularity of his musical piece 'Rhapsody in Blue'.
Step-by-step explanation:
Time Magazine put Gershwin on the cover because of "Rhapsody in Blue".
Rhapsody in Blue is a musical composition by George Gershwin which was first performed in 1924. It's one of the most famous American musical pieces, celebrated for blending elements of classical music with jazz influences. The popularity and significance of Rhapsody in Blue led to George Gershwin being featured on the cover of Time Magazine in 1924 - a testament to his impact on the musical landscape.
While Gershwin created numerous works, "Rhapsody in Blue" remains one of his most enduring legacies, often serving as a bridge between the worlds of 'serious' classical music and more popular jazz styles. Time Magazine has long been recognized for profiling noteworthy figures who have had significant cultural influence, and Gershwin's portrait gracing its cover was an acknowledgment of his profound contributions to music.