The Music Worx community is only for contacts who are registered with Music Worx and wish to receive promotions. You can change the setting in the SETTINGS.
Also, banner placement, social promotion or SoundCloud promotion is only available on accounts and platforms where Music Worx is registered.
Third party communities are partner companies that send, publish or book our promotions to their own community. These are select partners who achieve good results and are professionals in their field.