Website promotion to social networking groups etc

have a website that I want promoting and my target audience singer fanbases in the UK I am not interested in traffic only so driving irrelevant traffic to the site with auto hits/surfing etc is of no use to me as I will judge the project on sales alone. Let me know what you can do and a rough outline as to how long you think it will take for efforts to turn into sales. I specifiaclly want to target social networking groups for artists and singers, I have certain groups on myspace,bebo, facebook in mind, , etc etc that I need to get the article to specifically and you will have to find these fan sites for artists and also similar fansites. I need to get this article visible to these groups