Porcupine Tree

“Anything that we sit down in, we’re good at.” This is Steven Wilson, 5.1 mixmaster nonpareil, discussing two of the gold medals that Great Britain won in the Summer Olympics — one in cycling, the other in rowing. If there were Olympic medals given for achievement in surround-sound mixing, then Wilson would own more golden hardware than Michael Phelps has collected a dozen times over.

To say “The Blu Album” is not to suggest that Steven Wilson’s Grace for Drowning (Kscope) is as wildly diverse as the Beatles’ “White Album” — even if Wilson rightly calls his own double-disc set “more experimental and more eclectic” than his previous solo outing, 2009’s Insurgentes, with jazz and classical influen