i don't have a PS2, nor FFX, but i discovered that these songs sound a lot like the one from FF7. if u find/found urself listening to Aeris' theme a bunch of the time, but lost interest in it, this can get u back into the mood.

Pure Heart is very soothing, and it sounds like an irish/celtic ballad. i get a feeling of nostalgia after i listen to it...*sigh*... makes me reminisce the good ol' days.

Sutekidane (Isn't it Beautiful) won't sound very familiar at first, but as i listen to it around 2:07, Aeris' theme pops into my head. it's a great song also.
a review of the album sung by RIKKI is available here, at Animetric.com. "Sutekida" the album has Pure Heart in it (pun intended) and two versions of Sutekidane (one w/ vocals, one instrumental).
to sum it up, if u like Aeris' theme from FF7, but u haven't listened to these songs in FFX (or if u never played FFX), u might be interested in this album.
SaYoNaRa.