I believe in Opeth's music, every element compliments eachother. Like other's have said, sure I'd definately buy an album of all acoustic music done by either Pete, or Mikael but it would not exactly be the same thing as Opeth(I bought Thou Shalt Suffer(all keyboard neo classical music) and enjoyed it but would in no way expect Emperor to change to doing all symphonic music). I think that's why Opeth fans are so open minded, if it was all one element then their would be a lack of certain fanbase. On the other hand if it was all non-acoustic then I don't believe they would have gained the fans that they presenty hold today. I am so happy that , for once, here is a band that has excellent death metal vocals plus the guy can really sing...and it's good! Unlike when I experienced some other groups where the vocal change just completely ruined the band direction. I love songs like "Benighted", "Harvest" (and the parts in "The Moor" where Mikael does the "woo woo wah -woooo's" ) I think those parts are priceless and beautiful but as are some of my favourite kick ass riffs (every riff in Nectar, beginning of Advent, the part in " The Leper Affinity" where they do the awesome pull off's, etc, etc!) .