I'm a big fan of progressive music & 'happy chill' music, with this tune being a bit of both
The game is Ar Tonelico II, a game from Bandai Games that hopefully will get ported to the US so I can give it a go =D
Here's the link,
http://ar-tonelico.jp/at2/
Once on that page hit the Enter button & a pop-up will come with the main site, the music should be on, if not just turn the sound on.
Oh yea it's a little under 5 minutes long too, but i'm a fan of longer songs too =]