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A tonsilabo is a syllable describing a tone of a certain relative frequency. Tonsilabos are used for writing or typing music in the form of text, as an alternative to music notation by design (drawing).
The concept of tonsilabos, as based on the music scale systems of Bharata or Guido of Arezzo and Zoltán Kodály, was invented in the year 2000 by Martin Strid, Sweden. The computer program Tone was developed shortly afterwards by Harald Breidenstein. The web site notes that development ceased in 2006.
Tonsilabos are used for denoting any kind of music using ordinary written characters only. In short, it is a rhythmisation of traditional solfège, though it is also capable of expressing many other properties of music with great precision, which cannot be well described by conventional musical notation. Such properties include rhythmically repeated syncopation, quarter tones and natural tones.
In English, the Esperanto tonsilabo terminology is used as defined in the Fundamento Tonsilaba.