If you liked this song then I suggest you check out this one other band, Opeth. They're pretty famous but surprisingly not a lot of people know them. Anyway, they're a melodic death metal band, and their songs also switch from death metal style vocals to clean vocals. They're probably the most talented bands I've ever heard in my life, and definetly worth a listen. Surprisingly, about half their material is acoustic. Also, their songs are on average 8-10 minutes.

Heres three of their songs.
More mellow and acoustic song - YouTube - Opeth - In My Time of Need (Live Lamentations DVD)
More death metal type song - YouTube - Opeth - The Leper Affinity (Live Lamentations DVD)
Another mellow acoustic song. - YouTube - Opeth-Harvest