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A fun DIY way of turning recycling into a creative musical project, using empty jars filled with water, and a Makey Makey kit.
Materials: Empty jars, wire, water, Makey Makey kit
Time: 15-25 minutes
Software: Scratch

Things to try:
You can easily make a full piano octave, and even more. All you need is one jar per piano key (there are 12 keys, white & black combined, in a piano octave).

Download Project Instructions (PDF)