Harmonica players are musicians who specialize in playing the harmonica, a small, handheld wind instrument. The harmonica produces sound when the player blows air into or draws air out of its holes, which are fitted with reeds. This instrument is popular in various music genres, including blues, country, and rock. Many harmonica players perform solo or as part of a band, often adding a unique sound to the music. Some notable harmonica players include Little Walter and Bob Dylan, who have contributed significantly to the instrument's popularity and versatility in modern music.