Tenori-on is an electronic musical instrument, designed and created by Japanese artist, Toshio Iwai and Yu Nishibori of the Music and Human Interface Group, Yamaha Center for Advanced Sound Technology. It consists of a screen, held in the hands, of a sixteen by sixteen grid of LED switches, any of which can be activated in a number of ways to create an evolving musical soundscape. The LED switches are held within a magnesium frame, which has two built-in speakers located on the top of frame, as well as a dial and buttons that control the type of sound and beats per minute produced.

There is also an LCD screen on the bottom edge of the frame. Using the connection function, it is possible to play a synchronized session, or to send and receive songs between two of the devices. Tenori-on was demonstrated at SIGGRAPH 2005 held in Los Angeles, CA in August, 2005 .

A detailed discussion of the design of the Tenori-on is given in a paper presented at NIME 2006 conference held at IRCAM, Centre Pompidou in Paris, France in June, 2006 . Toshio Iwai has been using the Tenori-on in live performances (such as at Sónar in Barcelona, in June 2006, and Futuresonic in Manchester, in July 2006, the Futuresonic 2006 live show had some good feedback from the audience and that was one of the most important triggers to make it a real product). The instrument was launched in London on September 4, 2007 for a recommended retail price of $1,200 (£599).

To promote this launch, three prominent electronic and experimental musicians -- Jim O'Rourke, Atom Heart, and Robert Lippok -- were invited to compose "demo" tracks utilizing the device. These tracks have since been released as promotional MP3s from the Tenori-on website. Iwai's intention in creating the Tenori-on is to create an electronic instrument of beauty.

In his own words:

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