Opeth - The Drapery Falls, Deliverence (melodic death metal with clean/acoustic parts)
From Autumn to Ashes - Short Stories With Tragic Endings (metalcore)
Gordon Lightfoot - If You Could Read My Mind (folk)
Dream Theater - The Spirit Carries On, Fatal Tragedy (progressive metal/rock)
Apocalyptica - Hall of the Mountain King (Grieg's famous classical piece performed by an electric cello quartet- the most evil song I have ever heard)
Tourniquet - When the Love is Right (a metal band writes a love song that is quite possibly the best love song ever written)
Blind Guardian - Noldor (power metal a la Iron Maiden with a LOTR theme)
and, the best song ever......
Blotto - I Wanna Be a Lifeguard (rock, fricken hilarious, I love this song!)