Another day, another song! Let's Go~
Guilty Crown Opening 1 My Dearest by Supercell
One of my favorite anime out there and best of all it has amazing OST, not only this one. Supercells voice is one of the most unique voices I've ever heard. There's something in her voice that makes you relax and feel at ease. I really recommend you to listen to all the song from Guilty Crown if possible, they're just amazing.
Original Video so you can see her magnificent performance.
Close Your Eyes and Listen!~