A nice UX treatment, if your service can handle it, is to start pre-loading on hover over the play button, that way the song is ready to play when the user clicks. It may seem like a minor thing, but it makes a big difference in usability, and your current design is sparce enough, with enough space that you would likely not get many false loads.

With SoundCloud in the financial trouble it is in, and sites trying to use their API without paying, you could have a very good resource here.

Have you got any plans regarding an api?