This model D concert grand by Steinway & Sons, developed by Emanuel Moór (1863-1931), is the only Steinway equipped with a double keyboard. It was built by Steinway for Werner von Siemens of Berlin and sold to him in 1929. The piano was purchased by the University of Wisconsin-Madison in 1961 for the use of Gunnar Johansen, artist in residence at the university at the time. After Johansen’s death in 1991, it remained unused for many years until John Schaffer, director of the School of Music, and Christopher Taylor, professor of piano at the school, began discussing the prospect of restoring it to optimum playing capacity several years ago. The completion of the rebuilding project by Steinway in 2007 marks the beginning of a new stage in the instrument’s life. This remarkable instrument is now used for selected tour dates by Taylor and heard in concert at its home at the university.
Christopher Taylor demonstrates the unique features of a special instrument that combines the harpsichord’s ability to double its keyboard with the sound of a modern Steinway piano:
The lower keyboard of 88 keys resembles that of a typical piano. The upper keyboard of 76 keys is one octave shorter in the treble but sounds one octave higher than the corresponding key on the lower keyboard. Each keyboard can be played independently but both can be coupled together by depressing a pedal located between the una corda (far left) and sostenuto (second-from-right) pedals. A catch mechanism allows the pedal to be retained in its depressed position. When the keyboards are coupled, each note played on the lower keyboard sounds both its own pitch and that of the key directly behind it on the upper keyboard, one octave higher. As a result, polyphonic textures available to the player are greatly expanded, volume levels may be increased, and chords which extend over two octaves may be played with one hand.