I always play music via Winamp when I'm playing games like Counter-Strike, Half-life 2, or Battlefield 2....I think all games should have a built in Mp3 player like this.
Yeaaa....though now If I sell more than 5000 units or make more than $100k I have to give the Mp3 people $2500 bucks...which I'm totally cool with :-)
I still have to add a vertical scroll bar for the playlist, optimize the visualization, add cool button-over effects....and append "Now Playing: " to the song name, and scroll that accross the top...like a news ticker. I think that would look cool.
More stuff later on..sleeep time.