The Playtron (by Playtronica) is a touch-sensitive MIDI controller that transforms up to 16 everyday conductive objects—such as fruits, vegetables, plants, water, and metal silverware—into musical keys.
It does not have speakers so you need to connect it to a device to be able to hear the music.
Instructions are available online
My kids used it to make a keyboard out of leaves
MIDI musical instrument kit (Old Mountain View)
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