Louis Prima and Keely Smith were a significant American musical duo in the mid-20th century, known for their unique blend of jazz, swing, and pop. Louis Prima, a trumpeter and singer, was renowned for his lively performances and comedic stage presence, while Keely Smith, his singing partner and wife, provided a cool counterpoint with her smooth vocals and deadpan demeanor. Their most influential works include the Grammy-winning "That Old Black Magic" and "Just a Gigolo/I Ain't Got Nobody," a medley that continues to be a staple in pop culture. Their distinctive sound and dynamic performances greatly contributed to the popularity of swing music in the 1950s.