My MP3 Player design is a wall-mounted visualizer with on-board speakers and MP3 storage. The idea is to have a purpose-built product explicitly designed for party spaces that works as a stand-in for a DJ and fancy lighting system during smaller gatherings.
Default appearance - Song scrolls along bottom in marquee
Upon clicking the bottom bar, controls show up (LEDs)
Several interface findings -
I had to add a finger icon to indicate to people that you were able to click on the bottom bar. Once the ubiquitous play/pause/etc buttons were visible, that was not a problem.
The visualizer button is a little unclear. It may have to be animated to convey the meaning better.