Yes, the site indexes external websites (like Google) such as blogs and personal pages, then finds links to media from these sites and gives users searching SongFast the links to these external files. SongFast merely supplies links to searchers.
Very simple. Very straightforward. Very nice. I would replace the warnings with your different search tips. The warnings can go on a separate page. Just place a small "disclaimer" or "terms of use" as a footer link. Add "onclick" to the search box so when a user clicks on the box it automatically highlights the text. It would make it much easier to use. Your Amazon ad drops far down the page with large search results. I usually don't suggest more ads, but I would put more on the left column of search results.