Ηow is a melody created when someone strokes a glass of liquid with their wet finger?

Question

Ηow is a melody created when someone strokes a glass of liquid with their wet finger?

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Answer 1

The glass resonates at a certain frequency. Think of the finger as a bow being drawn across a violin string. So as you rub your finger across the rim it cause the glass to vibrate making a sound. The pitch of the sound can be regulated by the amount of water in the glass. More water means a higher pitch. So by choosing the correct glasses and measuring the correct amount of water one can essentially create a scale of all the notes and therefore play a melody.