Letta Mbulu is a South African jazz singer who made significant contributions to the musical world from the 1960s onward. Notably, she is known for her distinctive voice and incorporation of traditional African elements into her music. Mbulu achieved international recognition when she performed the Swahili chant in Michael Jackson's hit song, "Liberian Girl." Her influential works include albums like "There's Music in the Air" and "Letta," which both showcase her unique combination of jazz, pop, and Afro-pop musical styles.