MIDI (Musical Instrument Digital Interface) composition, takes advantage of the MIDI interface to allow musical data files to be shared among various electronic instruments by using a standard list of commands and parameters known as GENERAL MIDI (GM).
Because the musical is simply DATA and not actually recorded wave forms, (the data is essentially a series of "on" and "off" commands, along with numerical information) and is therefore maintained in a small file format.
Several computer programs allow manipulation of the data so that composing for an entire orchestra is possible and can be reproduced by any electronic instrument that adheres to the GM standards.
There are many websites that allow downloads of popular songs as well as classical music.
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