There are a handful of ways to promote your hip hop music online. Most artist put together a mixtape and submit that to mixtape websites. There is a top 10 list which includes datpiff.com ,livemixtapes.com, coast2coastmixtapes.com and many more. The first thing to do is create a profile and upload your mixtape.
You should receive views since it is a new upload. You can also go around the website and post comments on other user profiles or other mixtape uploads. The more comments you leave the more chance you have to reach more views, downloads, and build a larger fan base. With some of these websites you have the option to put keywords.
Use good keywords. Use keywords to describe your music. Your hometown. Users search relative terms such as "Allentown Hip hop music" "North Carolina local hip hop" Create social bookmark profiles suck as digg.com, reddit.com, stumpleupon.com and bookmark your mixtape page on every bookmark site you created. This will generate some traffic from the bookmark sites. And also motivate users to bookmark your page. Find "Hip Hop" blogs and post comments on the articles you find on the website. You do not have to be spammy.
You have the option with most blogs to post a Name ( where you would place your main keyword;MoneyBrown Allentown Hip hop ) Link (Link to mixtape ) Email, and Comment. Leave a decent comment so it does not look spammy. Do this to a few blogs a day and this will generate more views and downloads for your music. You can also take your cover art for your mixtape and upload a few songs from your mixtape to youtube. Make sure you place link in description back to your mixtape page. Title the video using good keywords including your Artist name. THis will and can generate long term traffic. This is all a lot of work. This must be done daily to keep your views up