Harmonica

Image: Encyclopedia of Appalachia

Bob Dylan used to wear one of these on a rack around his neck so he could blow on it between the stanzas of his lonesome ballads and protest songs.

I had one too -- a Hohner like the one in the picture, but I never mastered playing anything but the most rudimentary melodies on it.
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Penny whistle

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Kalimba or Thumb piano