A child prodigy, Mozart wrote his first symphony when he was eight years old and his first opera at 12. He went on to write some of the most important masterpieces of the Classical era, including symphonies, operas, string quartets and piano music.
The Glass Armonica is an instrument invented by none other than Benjamin Franklin, founding father of the United States. The instrument consists of a series of rotating glasses played with the finers.
Composers were also struck by the haunting sounds produced by Franklin's instrument. Mozart wrote two pieces for the instrument including this "Adagio and Rondo 617".