6.5.1829.godine, Cyrill Demian, graditelj orgulja i klavira, predstavio je komisiji za autorizaciju patenta prvi prototip današnje harmonike. Odlukom UNESCO-a ovaj datum se slavi kao Svjetski dan harmonike. Svim izvođačima ali i ljubiteljima
From Knowledge to Performance: Studies on the Accordion Contemporary Music Repertoire in Europe 3rd EPARM Congress, CNSMD Ly
Akkordeon-Orchester Wesseling - Am 6. Mai 1829 hatte der Wiener Klavier- und Orgelbauer Cyrill Demian seine Erfindung "Accordion" zum Patent angemeldet. Kurz darauf erhielt er ein kaiserliches Privilegium "auf die Erfindung eines
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