Jankó keyboard

Design and characteristics

Often described as a "6-plus-6" or six-row keyboard, the Jankó layout stacks keys in staggered vertical columns so that each musical pitch can be sounded by multiple adjacent keys. A typical implementation gives three vertically aligned keys for every pitch, and an 88-note range would therefore require many more key surfaces than a standard keyboard. The rows are arranged to give the thumb its own accessible channels, intended to improve hand movement and reduce awkward stretches.

How it works

Because the pattern repeats uniformly, a single fingering for a scale, chord, or interval can be shifted to any starting pitch with no change in hand shape. This makes transposition straightforward and can simplify technical passages that are awkward on the conventional keyboard. The layout is related to other isomorphic designs and is sometimes referred to when discussing ergonomic or alternative keyboard systems such as the six-plus-six keyboard family of ideas.

History and adoption

Paul von Jankó proposed the layout in the late 19th century to address perceived mechanical and pedagogical shortcomings of the traditional keyboard. Despite its theoretical advantages, the Jankó keyboard saw only limited adoption because it required retraining pianists, deviated from established instrument manufacturing, and was incompatible with the physical appearance and repertoire expectations of standard pianos. A few mechanical and electric instruments were built in the early period, and the concept has resurfaced occasionally with electronic keyboards.

Uses, advantages and limitations

The principal advantages include consistent fingering across keys, simplified transposition, and potential ergonomic benefits that reduce large hand stretches. Modern electronic implementations can exploit these strengths without the cost of rebuilding acoustic actions. Limitations are practical: the steep learning curve for trained pianists, lack of instrument standardization, and difficulty adapting printed music and pedagogy.

• Advantages: uniform fingering, easier transposition, potentially faster technical work.
• Limitations: unfamiliar layout, manufacturing complexity, limited repertoire compatibility.
• Modern note: small-scale electronic instruments and hobbyist builders keep the design alive; one commercial example is the Chromatone electronic keyboard.

The Jankó keyboard remains an important and well-known experiment in keyboard design. It is studied by instrument designers, theorists and performers interested in alternate techniques, even though the standard keyboard remains dominant in practice.