Toots Thielemans (born Jean-Baptiste Frédéric Isidor, Baron Thielemans, 29 April 1922, Brussels, Belgium) is a Belgian jazz musician known for his guitar and harmonica playing as well as his whistling. Thielemans is credited as one of the greatest harmonica players of the 20th century. He may be best known to some as the performer whistling the melody in commercials for Old Spice cologne.