While in London in 1757, Benjamin Franklin attended a concert where a musician played drinking glasses by passing a wet finger around the rim of the glasses. The glasses were different sizes and had different amounts of water. Franklin writes, "Being charmed with the sweetness of its tones, and the music he produced from it, I wished only to see the glasses disposed in a more convenient form." Franklin worked with a London glass blower to produce the glass bowls. In 1761, Benjamin Franklin invented the Glass Armonica.