Location of own Soundtracks on XBOX

[Da|Bears]

hi,

first of all I wondered where the XBOX copies my music from cd to.
I think its copying the soundtracks to the hdd E. But where are these soundtracks? It takes time and time to copy music from disc 2 xbox... so I thought about it 2 copy the music per ftp on the hdd. I know that has to be in WMA-fomat. I downloaded a converter mp3 ² wma... is it possible to copy my music from pc to xbox? or is there only the way from cd-rw 2 hdd... I want to know where the custom music is located on my xbox

thx and gr33tz from germany