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Many blues fanatics consider that a band or a song without an harp is not real blues.
By the way, each harp can only play one key, so you must have several harps in order to play diffrent songs.
Hohner are maybe the most famous one since the first harp was a Hohner, but we have also to remember that Little Walter was the first that used to play a harp using a microphone directly connected to an amplifier, creating a unique sound.
Sonny Boy Williamson
Little Walter
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