Demo (music) - Wikipedia
https://en.wikipedia.org/wiki/Demo_%28music%29
A demo is a song or group of songs typically recorded for limited circulation or for reference use, rather than for general public release. A demo is a way for a musician to approximate their ideas in a fixed format, such as cassette tape, compact disc, or digital audio files, and to thereby pass along those ideas to record labels, producers, or other artists. Musicians often use demos as quick sketches to share with bandmates or arrangers, or simply for personal reference during the songwriting
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