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I'm not aware of many but there is Musix: http://www.musix.org.ar/en/index.html Cheers!

Coauthor of Beginning Fedora: From Novice to Professional published by Apress.

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What is Musix GNU+Linux? More screenshots It's a 100% free multimedia operating system intended for music production, graphic design, audio and video edition, and all kind of tasks. It contains an enormous collection of free (as in freedom) programs that can replace Windows. (More details: here /// Download /// A nice review at GNU/"Linux Journal". /// Video-Demo) How does it works? The system will boot from your CD/DVD drive, with no need to install anything on your hard disk. Later, it can be installed. Supported languages Spanish, Galician, Catalan, Basque, English (docs), Portuguese(docs) and French (docs). These two last ones were supported from version 0.30. Now we support German and Italian too, but the user could install almost any language. Free software In order to be considered considered free software, its users must have the following four freedoms: 0) The freedom to run the program, for any purpose. 1) The freedom to study how the program works, and adapt it to your needs. Access to the source code is a precondition for this. 2) The freedom to redistribute copies so you can help your neighbor. 3) The freedom to improve the program, and release your improvements to the public, so that the whole community benefits. Access to the source code is a precondition for this.