A media player that beats inside your address bar
A web experiment (ab)using HTML5 history API when the thing was still new in the browsers.
The big O inside the address bar represents the current mouse position. Move the mouse pointer on the document to left and right to move O in the corresponding directions. When it appears over the controls, click the mouse button to take an action.
Beatbar uses soundManager awesomeness to play audio. Using HTML5 and Flash, SoundManager 2 provides reliable cross-platform audio under a single JavaScript API. The player streams audio from SoundCloud using their JS SDK.