DIATONIC HARMONIC 20-voice diatonic harmonica with tuning in E flat Major. The name evokes the typical blues sound. Synonymous with wide plains, open fields and pilgrimage. For more than 50 years, the harmonica has shaped the sound of blues, rock, and sometimes even folk. Blues Harp® is designed for this specific blues sound, but thanks to the modular system it can be easily adjusted and changed to anything you want, easy, fast and at any time. The comb, shaft and cover plates are interchangeable with all others in the MS series creating many possible combinations to suit your style.