Sleeping Sun by Nightwish, a Finnish metal band. The audio track appears on their Sleeping Sun (1998) single and Oceanborn (1998) album. Another recording of the same name appears on their Sleeping Sun (2005) single.
720p FLAC release:
http://depositfiles.com/files/knub5szol [97Mb]
This music video was filmed and recorded in 2000. There is another music video of the same name which was released in 2005.