I wonder if José Cid's album "10000 Anos Depois Entre Vénus e Marte" have influenced in any aspect the Opeth sound? I'm making this question because i've read somewhere that Mikael likes to hear that old 70's prog rock. And i think some aspects of their music are very similar!
Here is a link with one music from that fantastic album: http://www.progarchives.com/album.asp?id=3537
Here is a link with one music from that fantastic album: http://www.progarchives.com/album.asp?id=3537