Really a 5-star CD
The soundtrack of Ar Tonelico is splendid as a whole, and on this CD the best vocal tracks are presented. The OST is definitely one of the best from GUST, and this CD along with the Ao side is a collection of great vocal and instrumental tracks that will leave you in awe.
Also check the reviews of these CDs on rpgfan.com, they will also tell you that this CD, along with the Ao side, delivers on point and is worth your money, whether this is for you Ar Tonelico collection, or just for listening.