I wanted to familarize myself with the SoundCloud API. My first impression is that it is well written and intuitive. In Chrome the players automatically interact with one another, only allowing one player to play at once. The embed code is great, you simply add the same URL you use for a track, playlist or user to the url parameter within an iframe.
<iframe id="widget-list" src="https://w.soundcloud.com/player/?url=TRACK_PLAYLIST_OR_USER_URL_HERE" width="100%" height="465" scrolling="no" frameborder="no"></iframe>
I look forward to learning more and seeing what can be done.