Mozart didn't know the modern piano. The piano was in a much earlier stage and actually more similar to a harpsichord than to a modern piano. There were basically two types of pianos: the "grand piano" shape, which we still know today and the square piano for smaller rooms, which was much quieter. The latter one (which you can hear in the video) creates a very intimate atmosphere and you can imagine the people in the end of the 18th centure playing on them in their living rooms, while a group fr

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