Chris writes: "I'm not sure if you've seen these already, but glass harmonicas have been around for quite some time. They were invented by Benjamin Franklin of all people. This company will make one for you in almost any tuning." Unfortunately, they're not cheap. G Finkenbeiner Inc charge $6,150 for two octaves, $19,345 for 42 notes. Glass Harmonicas were notorious at the end of the 18th century, when they were blamed for melancholia, convulsions in farm animals and the mysterious death of a small child. For the full story, check out this feature on Beware of the Blog which includes this [mp3] recording of an elderly bearded man playing 'Stairway to Heaven' on wine glasses in a New Orleans street.