I am going to think about a portal to distribute GPLed sheet music. My aim is to allow people to fork music (written in MusiXTeX , Lilypond, denemo, MusicXML, or Finale) and to give many versions of the same original piece. My goal is to allow recent music to be directly pushed in the public domain or so, instead of waiting 50 years after the death of the original composer. For example, if Joe write FooBar for piano and clarinet, someone else can modify it by patching it and making it longer, shorter, or for differents instruments. One can make an orchestra version, etc.. The main problem will be to find a good version tracking system, easy to use in M$ windows for musicians almost working with Finale.