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The pianist and pianobuilder of Beethoven Nanette Streicher opens a piano factory in Vienna and holds concerts and saloons in it while it is prohibited to meet in bigger groups unless You make music under the regime of Metternich and emperor Franz and she becomes one of the founders of the society of musicfriends 1812 in Vienna.
You have too much information here. I'd change it to:
An instrument maker founds a society of musicians in 1812 Vienna after building a piano for Ludvig van Beethoven.
Nanette is the protagonist not Beethoven, no her name is important, also the name of Musikverein which is the stage of the famous New Year`s Concert, played there every year. But I will work it over. The conflict and the twist are missing on this logline.