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| Opening measures of the String Quartet No. 4 Op. 18 by Ludwig van Beethoven.| Beethoven, Ludwig van: Quartette für 2 Violinen, Bratsche und Violoncello. Breitkopf & Härtel, Leipzig.| Ludwig van Beethoven| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:BeethovenOp18-4.jpg
| Porträt des Ludwig van Beethoven| www.answers.com| Karl Traugott Riedel| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Beethoven Riedel 1801.jpg
| | http://www.beethoven-haus-bonn.de| August Friedrich Oelenhainz| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Fjm Fürst von Lobkowitz.jpg
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