It is the same as embedding sound any place else, get a song that plays on the internet, or host your own from a website. Place the tune's URL starting after the "HTTP://" in between [-sound][/sound-] (without dashes) in the i-box.
This will allow the tune to play while the info box is open, but will turn off the minute they hit "Hide Board Info," or open message. I’m afraid this is the best you do for what you want. If you would like to see it in action, please check out the i-box I created for the FUN board: #board-1654.
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