^ Yeah it's only three strings that are ringing... just like a chord played in arpeggio.
I really don't think The Lotus Eater or Heir Apparent are the hardest songs to play. I think Mikael's hardest riffs are those he must sing over it while playing them. Take for example Deliverance. There are two or three riffs that are really hard to play while singing, trust me. Another example : Serenity Painted Death. Anyone knows how to play the chorus? Alright, now sing over it. Good luck. Now back on the main topic (most difficult song on guitar only, without singing along)... let me think...
Let's go in order.
I don't know enough about Orchid to tell anything about it.
Morningrise is nothing particularly difficult. Advent could be the hardest one (on the album), I think.
My Arms, Your Hearse, well not too bad, there are a lot of strange chords but again, not extraordinary.
Still Life is probally one of the most difficult album to play. The accoustic parts are way more complexe. There are some mad solos too, like in White Cluster. Serenity Painted Death and Face of Melinda are probally the two hardest songs on the album.
Blackwater Park has The Leper Affinity and the title song Blackwater Park that both have a good difficulty.
On Deliverance, Deliverance is with no doubt the hardest song.
Damnation could be skipped, I guess. But there are some pretty good riffs in there. The riff we were talking about above is one of them. Windowpane is probably the hardest one.
Now comes Ghost Reveries with many hard(er) songs like Ghost of Perdition and The Baying of the Hounds.
On Watershed, I don't know what to think. The Lotus Eater and Hessian Peel are the harder song.. oh and Heir Apparent (but not really..)
I'll try to make my list of hardest song by myself and correct me if you feel you need to, because I'm not sure about what I'll write. Those in bold are the harder from all in my opinion.
Advent
Black Rose Immortal (memory?)
When
The Moor
Face of Melinda
Moonlapse Vertigo
Serenity Painted Death
The Leper Affinity
Bleak
Blackwater Park
Deliverance
Ghost of Perdition
The Baying of the Hounds
The Lotus Eater
Hessian Peel