I would know of one way:
Put a CD (full with mp3's) into your Hi-Fi, turn it up and
start playing your mission ;D - tricky, isn't it?
Nah - MP3 ain't supported, so what's the big deal with
it then?
Everything you need to convert mp3 to ogg is for free
and in case you're really a total noob when it comes
to converting them -> there are a lot of tutorials, how
to convert.
That's not even an OFP thingy - just type into your google
"how to convert mp3 to ogg"
~S~ CD