Specific composer credits taken from this auction:
http://page.auctions.yahoo.co.jp/jp/auction/137110020
BGM作曲:森まもる
BGMオーケストラアレンジ:森まもる(03、04、06、08、09)
BGMオーケストラアレンジ:伊福部武史(02、05、07、10、11)
No credits of performers, but from the samples that used to be available, this is no orchestra album anyway.