demo

A demo version or demo of a song (shortened from the word "demonstration") is one recorded for reference rather than for release. A demo is a way for musicians to approximate their ideas on tape or disc, and provide an example of those ideas to record labels, producers or other artists. Musicians often use demos as quick sketches to share with bandmates or arrangers; in other cases a songwriter might make a demo to send to artists in hopes of having the song professionally recorded, or a music publisher may need a simple recording for publishing or copyright purposes.