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There is one almost forgotten chapter in the music history: Quarter-tone music: https://en.wikipedia.org/wiki/Quarter_tone

There has been pianos constructed to play this kind of music - I have seen one on display in Prague. It has three keyboards, one of them shifted (by a quarter-tone) and inside two full scale piano frames with strings. Quite a monster, though. There were some composers composing this kind of music (czech Alois Haba, for example) and one can find even recordings of this kind of instruments.

There is a picture on czech wiki: https://commons.wikimedia.org/wiki/File:%C4%8Ctvrtt%C3%B3nov%C3%BD_klav%C3%ADr_3.jpg

VitVit, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

There is one almost forgotten chapter in the music history: Quarter-tone music: https://en.wikipedia.org/wiki/Quarter_tone

There has been pianos constructed to play this kind of music - I have seen one on display in Prague. It has three keyboards, one of them shifted (by a quarter-tone) and inside two full scale piano frames with strings. Quite a monster, though. There were some composers composing this kind of music (czech Alois Haba, for example) and one can find even recordings of this kind of instruments.

There is a picture on czech wiki: https://commons.wikimedia.org/wiki/File:%C4%8Ctvrtt%C3%B3nov%C3%BD_klav%C3%ADr_3.jpg

VitVit, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

The August Forster website contains additional information. The first of his/their quarter-tone pianos was a grand built in 1923 for Alois Haba. It contained two actions tuned a quarter-tone apart. In 1928 another version of the instrument was built for Ivan Wyschnegradsky.

Here is an image from the patent (SOURCE).

There is one almost forgotten chapter in the music history: Quarter-tone music: https://en.wikipedia.org/wiki/Quarter_tone

There has been pianos constructed to play this kind of music - I have seen one on display in Prague. It has three keyboards, one of them shifted (by a quarter-tone) and inside two full scale piano frames with strings. Quite a monster, though. There were some composers composing this kind of music (czech Alois Haba, for example) and one can find even recordings of this kind of instruments.

There is a picture on czech wiki: https://commons.wikimedia.org/wiki/File:%C4%8Ctvrtt%C3%B3nov%C3%BD_klav%C3%ADr_3.jpg

There is one almost forgotten chapter in the music history: Quarter-tone music: https://en.wikipedia.org/wiki/Quarter_tone

There has been pianos constructed to play this kind of music - I have seen one on display in Prague. It has three keyboards, one of them shifted (by a quarter-tone) and inside two full scale piano frames with strings. Quite a monster, though. There were some composers composing this kind of music (czech Alois Haba, for example) and one can find even recordings of this kind of instruments.

There is a picture on czech wiki: https://commons.wikimedia.org/wiki/File:%C4%8Ctvrtt%C3%B3nov%C3%BD_klav%C3%ADr_3.jpg

VitVit, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

There is one almost forgotten chapter in the music history: Quarter-tone music: https://en.wikipedia.org/wiki/Quarter_tone

There has been pianos constructed to play this kind of music - I have seen one on display in Prague. It has three keyboards, one of them shifted (by a quarter-tone) and inside two full scale piano frames with strings. Quite a monster, though. There were some composers composing this kind of music (czech Alois Haba, for example) and one can find even recordings of this kind of instruments.

There is one almost forgotten chapter in the music history: Quarter-tone music: https://en.wikipedia.org/wiki/Quarter_tone

There has been pianos constructed to play this kind of music - I have seen one on display in Prague. It has three keyboards, one of them shifted (by a quarter-tone) and inside two full scale piano frames with strings. Quite a monster, though. There were some composers composing this kind of music (czech Alois Haba, for example) and one can find even recordings of this kind of instruments.

There is a picture on czech wiki: https://commons.wikimedia.org/wiki/File:%C4%8Ctvrtt%C3%B3nov%C3%BD_klav%C3%ADr_3.jpg