Looking at Rei smiling listening this soundtrack "B-20 il tuo sorriso" is heartwarming.
https://youtu.be/TwvZpJRq5Ho?si=H1m24HIDdINRWsL7From the title (your smile) to the remix of Rei II it is a dedication. When the flute plays Rei II, it gives me the feeling of something fairy-like. I love it. Also, i think there is a bit of Rei III too