How do you make noise/music with a gl?

It's harmonics. You have to have a paticular type of gl, thin crystal is best (red wine goblets) but you can also do it with a normal drinking gl. You need to wet your finger to glide it over the rim lightly. Not too much pressure or too much water, but enought to create friction. What your doing is causing a vibration that creates a sound inside the gl. The amount of water that's in the gl changes the tone. That is why in the movie she had different gles at different levels.