Johnny Dunn was an influential American jazz cornetist, vaudeville performer, and recording artist in the early 20th century. Known for his unique "wah-wah" mute style, Dunn's work significantly contributed to the development of jazz music. He played a key role in the Harlem Jazz scene and collaborated with notable musicians like Mamie Smith and Perry Bradford. His most influential recordings include "Dunn's Cornet Blues" and "Vamping Sal," reflecting his signature blend of jazz and blues.