Their newest album just dropped and yet again it's great. I've only listened to it once but it seems to be one of their best. I'll post a track tomorrow.
Since the song I want to upload is 20 MB I'd like to see if anyone is interested before I do.
They combine death metal and progressive rock/metal. Their thing is long songs (except for one, the tracks on Watershed all last between 7-11 minutes) which take turns with heavy parts (complete with death metal vocals) and soft parts (with clean vocals and acoustic guitars). The two styles might mix but they're usually seperate sections in the song. The progressive rock influence comes from progressive rock bands from the 60s-70s like King Crimson. Plenty of mellotron throughout their stuff.
They also have one album with no heavy metal at all, just progressive rock.