From one of the best albums of 2005, Verisäkeet, Moonsorrow's Karhunkynsi builds for 8 minutes, and explodes for the last 6. This whole album is great, and to me Karhunkynsi is the high point of the album, though most feel that Jotunheim is the better track. Both are great.
This album wins my award for best non English vocal album of all time. Per Moonsorrow's official web page, the bloodverses are in Finnish, so it shall be. These guys have balls.