This is my last hope...I hope someone will find it for me...
It is the "Your Room" theme where you can change your costume or check your logs..etc.

PLZ I'd be really thankful. :)

Have you checked the soundtrack yet, it's not on it?

I've tried, but nothing to be found...neither the album nor the song :(

Oh wait, sorry I thought you were talking about PS Portable 2. Yeah the first doesn't have an official OST. Sorry ^^U
I've got an iso of the game, will take a look, see if i can do a game rip.

oh thanks a lot, thats very kind of you.

Ok, so I've managed to extract all the sounds/music/speech tracks from the game, which totals in 2,798 individual files.
It's all untagged and unsorted. I haven't played the first PS Portable so I don't know if "Your Room" theme sounds any different from the second game, so here are uploaded most of the actual bgm tracks. Take a look and see if you can find the one you're after. It's all converted to mp3 @ 320 kbps from the original raw data. If you'll find it and want the track in perfect lossless quality, then let me know which one is it, and I'll upload it in FLAC.

http://www.megaupload.com/?d=75B6Y2ZR (http://www.megaupload.com/?d=75B6Y2ZR)

Thanks a lot..:)
Found it and its in good quality.
I know I've put you into a lot of trouble, but seriously thanks a lot. Reps+ :)

Good, glad you found it :)