Topic: Two pianos in one?
In the video below you can see a duo performing Waltz of the Flowers by Tchaikovsky, in a concert many years ago in Helsingborg, Sweden. It seems they are using a piano with two keybeds. First I thought they were using two pianos, and they were just positioned against each other, so the biggest part of the woman's piano was hidden from sight.
However, there is only one lid, so it seems to be just one piano. How do they do this? Are there two soundboards in the piano, or are they careful enough not to hit the same notes by dividing the piece in such a way, and there is only one soundboard? This puzzles me! You can see the whole piano at minute 4:57 in the video.
https://www.youtube.com/watch?v=jWNQ_CH-8RY