Two sketches from one of Rolf Keller’s sketch book, showing two undidentified pianists. I don’t know if this sketch originated during a concert (perhaps a musical competition, since the sketches seem to show two different people) or during a more private setting. It might have been on a trip to the Sovjet Union as well. Unfortunately, these sketches are not dated and I don’t know when and where they where made. I wonder if it might be possible to identify these pianists. Doing so would yield a clue to when and perhaps these sketches where made.