Arcturus - Sideshow Symphonies from 2005 has been added to the Season of Mist Bandcamp. You could call this cerebral metal. The atmosphere is airy and mournful. The music is progressive, avant garde even, with just the slightest hint of black metal. The whole album has the feel of a rock-opera.
The focus is on song structure and vocal hooks though. Combine those hooks with the beautiful operatic tenor of Simen Hestnæs and you get parts that sounds like a-ha playing metal (and that is a good thing). Fantastic stuff. Here's one review from Metal Review and here's eleven more from The Metal Archives.
[Go to the post to view the Bandcamp player]