PC World Germany - Link Loosely translated: "Musopen wants free public access to music, which in legal terms is the public domain.
It is mainly classical works. The music comes from individuals or university
orchestras that allow the free dissemination of their music.
This may not always be the work of highly paid professionals, but in many cases is quite worth hearing.
Even for experimental interpretations it is a great source. Our sample came with all the MP3s at a decent 256 KBit/s."