The harmonica is one of the most important, yet overlooked, instruments in music. This definitive volume celebrates the history of the world's most popular musical device, its impact on various forms of music, folk, country, blues, rock, jazz and classical music. The author traces the development of the harmonica from the ancient Chinese sheng to futuristic harmonica sythesizers. Nearly seventy harmonica masters are profiled including Stevie Wonder, Little Walter, Bob Dylan, Jimmy Reed, Charlie McCoy, Sonny Terry, and John Popper. This updated edition includes an extensive new afterword, an expanded discography of the finest harmonica recordings, and a listing of the best harmonica resources on the internet.