American Buddhist Net

...they invented the first musical instrument ‘played without a player’. This device could create its own music with no human influence. It was called the Aeolian harp. Built by the Greeks probably in the fifth century BC it represents the first automatic instrument in history.

The harp got its name from the Greek god Aeolus, the ruler of winds, and with a good reason. The instrument is basically a wooden box which has two bridges connected by strings. The strings are all of the same lengths but can vary in thickness and, very importantly, tuning. It was placed near an open window so the wind currents could pass over the string goading random compositions. Varying pitches could be produced thanks to the diversity of the strings or the power of the wind. The later is responsible also for the intensity of the sound which could range from being barely audible to loud.

LINK TO ORIGINAL