Hohner 37 Notes Melodica37 keys Tone range of F below middle C through F Bronze reeds This three octave professional instrument produces a rich accordion like tone. The Pro 37 Melodica is a hand held wind instrument has 37 piano style keys with a tonal range is F below middle C through F. It features durable bronze reeds that won't loose their pitch. The S37 is Ideal for students as well as advanced players. Deluxe padded zipper case, mouthpiece and extension hose included.