Glass harmonica the result would be musical cacophony. This modification also made it much harder to make the glass "speak", and muffled the sound. In 1975, an original armonica was acquired by the Bakken Museum in Minneapolis and put on display, albeit without its original glass bowls (they were destroyed during shipment). It was purchased through a musical instrument dealer in France, from the descendants of Mme. Brillon de Jouy, a neighbor of Benjamin Franklin's from 1777 to 1785, when he lived in the Paris suburb of Passy. Some 18th- and 19th-century specimens of the armonica have survived into the 21st century.
Adagio and Rondo for glass harmonica, flute, oboe, viola and cello purchased by Zweig from a Berlin auction house in 1930. The work was first published by Breitkopf & Härtel in 1799. The adagio, in C minor, is 58 bars long, while the rondo (C major) contains 230 bars. According to Willi Apel, "Among various compositions for the glass harmonica, Mozart's Adagio in C major (K. 356) and Adagio and Rondo (K. 617)...both composed in 1791, are the most interesting. They seem to require an instrument equipped with a keyboard mechanism such as that constructed in 1784." Adagio and Rondo for glass harmonica, flute, oboe, viola and cello The Adagio and