Where can I market U.S. Hip-Hop/Rap artists online that specifically targets to the European market?

I have American Hip-Hop/Rap artists that are "alternative" in nature and would more then likely be embraced and loved by the European or international market. Where can I market their music on the internet that will be specifically directed to the European market? Some artists are looking to put out free music and some are looking to sell their music. Are there any reputable European Hip-Hop/Rap websites that cater to Indie artists or message forums?