Credits can be found here, though track-by-track is lacking:
http://bsm.hp.infoseek.co.jp/data-other1.html
I used Ramza's romanizations for the arrangers from here.
http://www.rpgfan.com/soundtracks/srta/index.html
Most of these arrangers seem to be unknowns for now.
Also, most of the music comes from various animes. Hopefully someone who knows anime music can track down the composers credits for each track.