I made a music note out of LEGO that will help young kids learn rhythm. The music note can be a whole note, half note, quarter note, or eighth note depending on how it is shaped. It uses a hinge to make an eighth note, the removal of a few pieces to make a half note, and the removal of the square and separation of the long part to make the whole note. With less than 40 pieces per music note, this simplistic MOC can serve as a way for kids to play with music. If this becomes a set, I would add more music notes to create more rhythms.