I was thinking about trying to chart some songs that my various relatives have put out, and I ran into a problem. My aunt does vocals and guitar style music, and I think people might like it on Rock Band. But, It might be annoying to people to have only two instruments, so I thought it might be possible to chart the second, more rhythm-like guitar that's on some of the songs, to bass.
Is this flat-out not allowed? Or would it be allowed under certain circumstances?