The music you are listening to was written for a musical clock by the great Austrian composer Joseph Haydn.

A musical clock is a very small pipe organ fitted inside a clock case. It plays tunes on the hour. In the old musical clocks the pipes were played by pins fixed to the surface of a slowly rotating barrel driven by the clock spring that also worked the air supply to the pipes.

This piece is being played on a modern musical clock driven by a computer but nevertheless playing real organ pipes.

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The makers of the clock in this recording are HOLMBERG MUSICAL CLOCKS, USA. See their fascinating website at http://www.holmbergclockworks.com/contact.html