Musical glasses

Also called glass harmonica ( glass armonica), this is an instrument that consists of a set of glasses tuned to different notes, usually by filling the glasses with liquid to attain the pitches. The glasses are sounded by rubbing the rim or by lightly striking them. Ben Franklin and Wolfgang Amadeus Mozart both worked with this instrument.an instrument made up of various sizes of drinking glasses, filled with liquid or sand to produce different pitches when rubbed with a damp finger