You can make art out of glass, or you can make art with glass. For the former, see The Art of Glass Blowing. For the latter, see the videos below.
William Zeitler-Glass Armonica
The glass armonica was invented by Benjamin Franklin. This video is an excerpt from a History Channel documentary about Benjamin Franklin.
Glass Armonica-From the History Channel
Of course, you don't have to use a glass armonica. The following video features a true virtuoso on a simple collection of wine glasses.
There's more than one way to get sound from a glass vessel. You can caress it gently, or simply hit it with a stick. Here's an example of some music achieved with the less gentle approach.
Glass as Percussion, Vivaldi
See also: The Art Of Glass Blowing
Glass Music Links
The Glass Armonica
William Zeitler, The Music and Magic of the Glass Armonica
Glass Armonica at the National Music Museum