Could anyone tell me if background music can be used on geeklog and if so what do i have to do to get my website playing music in the background

Yes you can, as it is more or less html. So check any html tutorial on that:
http://www.tizag.com/htmlT/music-code.php

i recommend to aquamp player...

I'm using this on my site --> http://www.moderntalking.biz/

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_KEMAL_