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
Glass harmonica instrument on display, which is occasionally used for public performances and recordings. Composers including J. G. Naumann, Padre Martini, Johann Adolph Hasse, Baldassare Galuppi, and Niccolò Jommelli, and more than 100 others composed works for the glass harmonica; some pieces survive in the repertoire through transcriptions for more conventional instruments. European monarchs indulged in playing it, and even Marie Antoinette took lessons as a child from Franz Anton Mesmer. Wolfgang Amadeus Mozart wrote his 1791 K. 617 and K.356 (K.617a) for the glass harmonica. Ludwig van Beethoven used the instrument in an 1814 melodrama "Leonore Prohaska". Gaetano Donizetti used the