The double bass harmonica is not exactly a common instrument. It was more
popular several decades ago, when harmonica ensembles were more common.
The bass harmonica is a double-deck instrument with two hinged bodies, the
lower having all the natural notes, and the upper having all the sharps/
flats . so it is fully chromatic covering a range of two octaves, starting
with EE (like the lowest note on a bass guitar). Each of the holes of the
harmonica has two reeds tuned an octave apart . thus this harmonica has 58
reeds total. The double bass harmonica is an .all blow. instrument.

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