Electro-mechanical string-less piano released in 1950s / A hammer strikes the metallic reeds to produce vibrations, which result in a rich and fat tone; these tones are picked up by a pickup system, which then converts the tone into electric energy; the electrical energy was released in the form of an audio tone out of the built-in speakers, which were kept in front of the piano / Ben Meisser developed the basic principle of this piano, and Rudolph Wurlitzer developed this instrument further, and marketed and manufactured it / The first album using Wurlitzer piano was made in 1956 by Sun ray and the Demons.
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