Collect some old glass bottles.
Fill each bottle to different levels with water.
You can colour the water.
We have used ZOBO to colour the water in our musical bottles.

The more water you add the lighter the colour of the water will be.

The more water in your bottle the lower the musical note will be when you tap it.
Number your musical bottles 0-9.

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Can you make up a tune for your children to play ?