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This dinner trick reminds us of the Family Guy episode where Peter plays the glasses during a blackout. They sound very angelic with almost no definitive beginning or end.
There are two basic things you need to know before attempting to play a whistling glass symphony. Firstly, not every glass works for this bar trick. Just accept this. If you keep trying with poor results, find a different glass. Glass thickness, size, shape, base, etc. all affect the playability of this club trick and there is no set standard for what will work.
Secondly, the amount of water in the glass affects the pitch, but only to a certain degree. Each glass has it's 'sweet spot' where the sound is most pure. Too much water and it chokes the sound, two little and it squeals.
When attempting to make a glass sing for the first time, start out with a wine glass or a lightweight goblet. Shot-glasses can sometimes be a good substitute for this party trick, but it can be difficult for a beginner to start on something with such a small brim.
Fill the glass halfway with water. You may wish to experiment with different temperatures of water for your skin type, although once you get the hang of it this shouldn't matter.
Dip the index finger of your dominant had into the water and run it along the glass rim to wet it. Dip your finger a final time and begin a medium speed rotation around the rim of the glass. You want your finger to drag but not press. The idea is that you find a happy medium between the pressure that is applied from your finger to the glass. If you have sensitive fingers, you can feel a tiny tingling in your finger tip as the vibrations rattle your finger.
With a little practice, you'll be able to start & stop faster allowing you to jump between multiple glass sizes with ease.