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A 16-hole chromatic (top) and 10-hole diatonic harmonica

A harmonica was a box through which air could be blown to create sound. In a sequence of chambers, it created notes.

Marty McFly owned a harmonica and played it while back in 1692 Salem, Massachusetts to which it was branded a "Satanic death box".

Marty later played it the night before Comet Kahooey arrived over Hill Valley to which an elderly man at a bus stop recalled the strange alien sounds from 25 years prior.


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