[linux-audio-user] Web-based collaborative band/musicians app?

Hello, I'm looking for a web-based application that supports working on and discussing of music and pieces within an band. What do I would like to do with such an app: - Upload of mp3 takes which has been recorded during rehearsals or sessions. - Click somewhere in a timeline based image (e.g. amplitude/time or spectrum/time) and the playback starts there. - Define views on parts of an mp3 recording, because they are sometimes several hours long and often contain different songs and lots of talk - Attach Comments (of different musicians) to certain parts or timestamps of a recording - Discuss pieces, eventually with inclusion of some staves (which should be rendered on the server). - All editing should be stored in a versioning repository, like most wikis do. - It should be usable be musicians who don't have a degree in information sciences and who don't want to spent to much time with the platform itself. Perhaps something like a wiki for musicians. - Hardware requisites on the user side should not be more than be a web browser (graphics based) and a mp3 playing app that is capable to play back streams. What I'm _not_ looking for: - Something like Ardour with a web frontend (ok, it wouldn't be a show stopper if it's features were available as well). So, before starting to write something like that on my own from scratch I would like to know, if there is some similar project out there in the world that needs some contribution instead and that would be usable in the short term. Thanks for reading, Yours, Jacob