Ar tonelico is an rpg based on music, created by a soundtrack composer, so it has an excellent pedigree, and it lives up to that pedigree and surpasses it by a huge margin in my opinion. The gameplay isn't hard, but the story of the game as well as the sequel is excellent and rich with fun and deep characters. The soundtrack reflects this, with each composition and hymn telling the listener something not just about the setting, but about the characters and the world as a whole. This is the best music in any game/rpg you can find, and while the graphics aren't 3D and it doesn't have too outrageous or groundbreaking gameplay save for the Dive system, the soundtrack pulls all of this together and makes the game better because of it. In short, the soundtrack is one of the best, the vocals are beautiful, and they are perfect in what they do for the game.