Algorithmic composition is the technique of using algorithms to create music.
Algorithms (or, at the very least, formal sets of rules) have been used to compose music for centuries; the procedures used to plot voice-leading in Western counterpoint, for example, can often be reduced to algorithmic determinacy. The term is usually reserved, however, for the use of formal procedures to make music without human intervention, either through the introduction of chance procedures or the use of computers. There is a radical distinction (both in terms of philosophy and in the heard result) between composers who use indeterminate (e.g. stochastic) procedures to compose music and those who use routines which produce deterministic results given a fixed input into the algorithm.
Many algorithms that have no immediate musical relevance are used by composers as creative inspiration for their music. Algorithms such as fractals, L-systems, statistical models, and even arbitrary data (e.g. census figures, GIS coordinates, or magnetic field measurements) are fair game for musical interpretation. The success or failure of these procedures as sources of "good" music largely depends on the mapping system employed by the composer to translate the non-musical information into a musical data stream.
More on [ Algorithmic composition ]

Fractal Music - Links to fractal music sites, as well as free fractal music generation applets and related information.
Fractal Music Lab - Tools and information on exploring and advancing the musical use of fractals. With sound samples, software, and articles on fractals and composition.
The Music of José Oscar Marques - Fractal compositions in general MIDI file format.
Meta Description: [ midi files of classical, jazz and original music. ]
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