Street Musician by Fedor Grigorev Playing Glass Bottle Xylophone

Glass Xylophone is a percussion instrument similar
which use Water Glasses with different amount
of water for different tones.
The more water added to the glass,
the pitch or frequency gets lower.
Because when you add water,
you also add more mass to the bottle —
the combined mass of the bottle plus the water.
More mass results in a slower/lower vibrating frequency,
and less mass produces a faster/higher vibrating frequency.
To play the instrument, lightly tap the side of
the glass with the spoon.

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