From Christian Dietz:
RokQ is a free MP3 player for your Windows PC. It is simple and user-friendly, just like a classical jukebox. RokQ takes a picture with your webcam every time a song gets queued. It queues up to 5 songs to give everyone a chance to queue a song. Playback is never paused or skipped. When the queue runs empty, a random song is played.
This free edition of RokQ quits after 2 hours and all pictures taken with the webcam show the RokQ logo.