So many bands fit this description; Insomnium, October Tide, Slumber, The Foreshadowing, The Vision Bleak, Moonspell, a lot of Devin Townsend's early stuff, etc. I don't particularly find many of the above posted songs sorrowful, but my tastes are different. No, the best that would fit this description has to be Kauan: Sorni Nai. An unbelievably mournful, melancholic record with rays of hope shining at unexpected moments that emit waves of promise and trust, keeping the album from being depressing.