Sonic information comes from natural and artificial sources.
Artificial sonic information comes from a wide range of sources, from speech to the noise of tools, from song to polyphonic instrumental music, and extending to artificially created sounds. Music is an improvised or pre-organized alternation of isolated or grouped sounds and silence, within certain time limits. A more or less aesthetic and meaningful content can be ascribed to these alternating sounds and silence according to their original source and their destination. Music's final value is determined both by environmental factors and by history. This definition of music specifies its limits in relation both to time and to its insertion in the sociocultural context whose characteristics are changing with extreme rapidity.