Answer
Toots Thielemans became a U.S. citizen in 1957. The Belgian-born jazz musician had moved to the United States in 1952 and quickly established himself as one of the leading harmonica players in the world. He played with many of the greatest jazz musicians of the era, including Charlie Parker, Dizzy Gillespie, and Miles Davis. Thielemans's unique sound and style helped to popularize the harmonica as a jazz instrument.