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Step 1: Slides
First cut off the sticky part of the post it note. Then cut the non sticky part of it in half.
Next wrap the 2 non sticky halves around two of the popsicles. Finally put tape on each slide/ halve.
Step 2: Base
Put the slides back on one Popsicle stick. Next put a rubber band lengthwise on the stick with the slides. Finally tape the two Popsicle sticks together.
Step 3: How to Use
Blow in the middle of the harmonica. To change notes, slide the slides back and forth.
Happy playing :)