I heard this for the first time last month at the River City Rockfest. I heard it again just yesterday on Ozzy's Boneyard. I can't get enough out of this song.
This isn't as heavy as what I usually listen to, but I just love the main riff of this song. Plus, it has Deep Purple legends Ritchie Blackmore and Roger Glover, along with the late Cozy Powell. This is off of Rainbow's first album without Ronnie James Dio, who by this time was about to replace Ozzy Osbourne in Black Sabbath.
Moonsorrow - Jäästä Syntynyt / Varjojen Virta beacause off course. No youtube link or anything, alas, either beacause it's been removed and shit, or beacause it's a half an hour song and IDK if youtube still has length restrictions