I agree we would want to start slowly and build from there ...
I would propose a closed group i.e. only approved members could post. I would propose that we limit members, at least initially, to those who are also members of this forum. This could be extended to "friends of the forum" over time. (As I mentioned,I am happy to administer this part, at least initially.)
All members would have visibility to all posts. They could also choose to share posts with their own networks, as they deem appropriate.
As an example, let's say Rightly announces the release of a song that you really like: you could choose to share that post with some/all of your network suggesting they check it out.
I really believe we have some talented artists on the forum and would love to be able to help get our music heard more widely!
Kevin