Starting out as a strictly viking/black metal band, Enslaved found that half way through their career they needed to change their style and progress into something more. The last several Enslaved albums have been dedicated to this style and it's something I really cannot describe to people. They still have elements of their black metal roots (mainly vocal style) but are also very influenced by progressive rock, mainly Pink Floyd but I can hear some King Crimson floating in their sound. Vertabrae to me is like traveling to another dimension - it's not an easy listen to the average ear, especially if you find prog rock boring, but it's a rewarding listen. Lulling clean chanting vocals, a ton of spacy and atmospheric synths, a clean guitar sound that is actually not very heavy distortion wise (making a very unique sound when the music becomes quite agressive)and alot of melody amounts to an epic journey stripped free from conventional contraints of music. In my opinion, together with Opeth, Enslaved are doing something all their own and are one of the most important bands in metal today. My suggestion is to check out the (really awesome) video below and judge the music for yourselves.
Please check out the video for "The Watcher"
http://www.youtube.com/watch?v=CGOHk2J4jV4