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Desi Arnaz's character, Ricky Ricardo, was a bandleader on the sitcom "I Love Lucy." He led a Cuban orchestra at the fictional Tropicana Club in New York City. The show's premise revolved around Lucy's misadventures as she tried to break into show business and interfere with Ricky's band. Arnaz's portrayal of Ricky showcased his musical talents and comedic timing, making the character an iconic figure in television history.