2 speakr format mp3 songs to surround 4.1 songs??

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hey guys,
i have a 4.1 surround creative sound system fixed to the onboard card of my motherboard(intel 865gbf). i get output for mp3 songs only on the two front speakers.....wat should i do so i get output in all 4 speakers? Is there any software that converts the mp3 into surround music or is it jus a hardware thing?? but for all my games i get surround music so its something to do with the mp3 songs themselves right? Please suggest a sofware to make music listening a better experience......