What do prog rockers do when the notes become too much? If you’re Porcupine Tree’s Steven Wilson, you chill out, slow the beats, and dust off the string synths. Blackfield is as established as PT these days, Wilson ensuring his brand’s viability as his fans grow old and gray. But there’s plenty here for those seeking their Floyd/Crimson fix. “Go To Hell” plays word games over a 7/4 groove, undulating guitar riffs, and Hans Zimmer-worthy strings; “Rising of the Tide” recalls Yes’ Jon Anderson collaborating with Nile Rodgers.