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Water Glass Music

Line up three or four cups filled with different amounts of water. Tap each gently with a spoon - different water levels make different tones. Experiment until a sequence sounds like a tune.

Cartoon illustration of a parent and child at home: line up three or four cups filled with different amounts of water.
  • Age4 to 7 years
  • Time15 to 30 minutes
  • EnergyCalm
  • CostFree
  • WhereIndoors
  • Prep5 min

Line up plastic cups with different amounts of water and tap each gently with a spoon to hear different tones. Experiment with water levels until a sequence sounds like a tune. Practices sound observation and cause-and-effect through simple musical exploration.

How to do it

  1. Line up 3-4 plastic cups. Fill each with a different amount of cool water: one nearly full, one half full, one a quarter full, one nearly empty.
  2. Tap each gently with a metal spoon. Listen to the tone together. Ask: "Which one sounds highest? Which one sounds lowest?"
  3. Let your child tap each cup a few times freely. Then ask: "What happens to the sound when you add more water?"
  4. Try adding a little water to one cup and tapping again to check if the tone changed.
  5. See if you can tap a simple tune together: even three notes of any familiar song is enough to feel like music.

What you need

  • Plastic cups
  • Water
  • Metal spoon
  • Tray or towel

Signs it is working

Your child notices that cups with different water levels make different sounds. They experiment with adding or removing water to change the tone, without being prompted. They tap the cups in a sequence of their own choosing and call it "a song"

If it is not quite clicking

The cups don't produce distinct tones: Check that you're using metal or hard plastic cups rather than soft flexible plastic: soft cups produce very little resonance. Tapping the side of the cup (not the rim) with a metal spoon produces the clearest tone. Child just bangs rather than listening: Slow down and tap once, pause, and invite them to listen to how long the sound lasts. Child can't hear the difference between full and empty cups: Try a more dramatic contrast: one cup nearly full and one nearly empty.

Make it yours

Younger, 3-4 years: Focus on just two cups with very different amounts; the question is simply "which sounds higher?": skip the tune-making. Older, 5-6 years: Add a fifth cup; try to arrange the cups in order from lowest to highest tone; attempt a recognizable 3-note sequence. Outdoor version: Works outside on a table or on the ground; spills don't matter outdoors.

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