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You are DJ’ing, making videos and want to add some free music to it or you want to play free music in your coffee-house? So there is no use in CC-BY-NC or CC-BY-NC alike music, as you may not build any derivatives of these songs (e.g. a video on youtube) or use them commercially.
Licences you might be interested are CC-BY, CC-BY-SA, Licence Art Libre, GPL SFA / Lizenz für freie Inhalte and also songs from the Public Domain.
Here are a lot more ressources for music that is under one of these “very free” licences:
These link to projects that offer music which is under one of the “very free” licences

Labels

• Alg-a netlabel – Spanish label releasing under various CC-Licences
• Alajazzrecords – Label from Mexico releasing under the CC-BY-SA – licence
• Loca Records – British label that releases under a CC-BY-SA – licence
• Musictrade.info – Here you find a selection of free licensed ambient, field recordings and jazz. Albums are released under a CC-BY – licence

Download portals

• Dogmazic.net – Music that is under all kinds of more or less free licences
• Jamendo – Big download portal for music that is under one of the Creative Commons licences or the Licence Art Libre
• Neppstar – Austrian Online Portal for music that is under the GPL-SFA / Lizenz für Freie Inhalte (LFFI)
• Opsound – “Musicians and sound artists are invited to add their work to the Opsound pool using a BY or BY-SA Licence by Creative Commons.”
• Starfrosch – BY – CC-BY licensed Songs published on Starfrosch
• Starfrosch – BY SA – CC-BY SA licensed Songs published on Starfrosch
• SectionZ.net – Online community of electronica artists. Up- and download content that is under one of the Creative Commons licences.

Various Sources for very free licensed music

• 100 CC BY hits - 100 Creative Commons hits available under the Attribution license (BY)
  
  
  
  If you stumble upon a site that offers content which is under a licence that allows making derivative works and commercial use as well you can add it in the Freemusicwiki and I will add it to this link list.
  

  Wikis

  
  
• Free music wiki – A trilingual wiki that holds and collects information on free music and related issues