An in-house fave here @ Make: Online, Rock Band 2 for Xbox360 will soon be opening up to independent developers à la iPhone’s App Sore. Peter Kirn of Create Digital Music gives an in-depth look at the what it will take to make your own music playable on the upcoming Rock Band Network. The process will require a licensed copy of Reaper audio software ($60, easily worth it on its own), a membership in Microsoft’s XNA Creators’ Club ($100), plus of course an Xbox360 & copy of Rock Band 2. The Network is currently in closed beta, with a launch planned for October. More details over at CDM.