Hi guitartabbooks,
Welcome to 5 Star. Well you could do a search on Technorati for music related blogs and try approaching them about becoming an affiliate.
The problem is some bloggers aren't very good at affiliate marketing and some even prefer not to have affiliate links on their blogs.
You may be better off looking for affiliates that have music sites, some may also have blogs.
You can do PPC ads to try to attract affiliates that are looking for guitar or music related affiliate programs.
You can also post a free announcement about your affiliate program down in the
Promote Your Program Here section of the merchant forum.