Buzz is right about Porcupine Tree. They are a band that anyone who likes a "progressive" sub genre of music, be it rock, metal or whatever, needs to listen to. The catalogue spans almost the entire repertoire of prog in all its incarnations, but over the span of 10 studio albums and over four times as many minor releases.

The brain behind it all, Steven Wilson, is in my opinion one of the few remaining heroes of genuine musical ingenuity and rectitude in this plastic age, and accordingly he's been in my every forum signature I've had since I made my first internet alias. At mention of Opeth, its worth noting that Opeths better releases were produced by and featured vocal, guitar and keyboard contributions by Wilson, who was contacted by Mikael (Opeth's hindmost) who made the request himself as an enormous Porcupine Tree fan.

His solo stuff is every bit as good as Porcupine Tree, and you'll be a richer man for listening to it!