The original where I sang myself is at http://soundcloud.com/chunter/snowflakes
This keychanged and more guitar-oriented version is sung by Sekka Yufu, a voicebank for the UTAU singing speech synthesizer.
Yufu: http://sekkayufu.web.fc2.com/
UTAU: http://utau2008.web.fc2.com/
chunter music collection 