Hi midori-chan, I've known this song for some time and me too, I love it =)
The music played by Rin' is amazing. I don't know what this traditional flute is called, but it sounds magical. I tried to translate the lyrics, but I couldn't understand a couple of lines, so I dropped it, too bad :/ It's incredible how the concert version is so much better than on the CD (for me, that is)...