The new Suzuki Humming, Deluxe Tremolo Harmonica is a superb example of state of the art technology that produces a beautiful old world sound. Tremolo harmonicas are diatonic models constructed with double holes, each containing two reeds tuned to the same note. Each reed is tuned slightly higher than the other and when played together, this slight difference in tuning creates a beautiful vibrato or tremolo sound. “C” positions are marked on the comb for easy reference during performances. Many different kinds of gospel and old world music sound wonderful using tremolo style harmonicas. This one just makes them sound that much better. Comes with carrying case. Available in eight keys: C, C#, A, G, D, Am, Gm, and Dm.