Ermz
¯\(°_o)/¯
BRI said:For Opeth's music I think that Steven is a better producer than Dan, mainly due to the fact that he is one of the true genius' within the Progressive Rock genre and Dan is more melodic death. Also, Dan's singing and growls are like Mikael, just not as good, which would be rather boring. However, Steven can add to Mikael's clean vocals and make it more interesting.
Anyway, as for PT, my favourite albums would be Lightbulb Sun, Signify and In Absentia.
Dan has a great singing voice. He'd have no trouble at all doing duets with Mike. His growls aren't subpar either, just a different style to Mikael's. Have you heard Moontower?
Dan is actually quite geared towards progressive rock and death metal, which coincidentally are the genres Opeth are most associated with. I don't see how a unison between the two could go awry.