Ernst Chladni at the understanding of electron orbitals. Since at least 1738, a musical instrument called a "Glasspiel" or "verrillon", created by filling beer glasses with varying amounts of water, was popular in Europe. The beer glasses were struck by wooden mallets shaped like spoons to produce "church and other solemn music". Benjamin Franklin was sufficiently impressed by a verrillon performance on a visit to London in 1757 that he created his own instrument, the glass armonica, in 1762. Franklin's armonica inspired several other instruments, including two created by Chladni. In 1791, Chladni invented the musical instrument called the "euphon" (not to
Adagio and Rondo for glass harmonica, flute, oboe, viola and cello Adagio and Rondo for glass harmonica, flute, oboe, viola and cello The Adagio and Rondo, K. 617, is a quintet composed by Wolfgang Amadeus Mozart for glass harmonica, flute, oboe, viola and cello. Completed on May 23, 1791 (the date indicated in Mozart's own list of his works), it was written for Marianne Kirchgessner, a blind glass harmonica virtuoso, who played the first performance in the Burgtheater Akademie on June 10, 1791, and subsequently performed it at the Kärtnertortheater on August 19, 1791. The autograph manuscript is in the British Library as part of the Stefan Zweig Collection. It was