Before the Mars Volta made prog-metal fashionable again - with a little help from the Dillinger Escape Plan and My Chemical Romance - Porcupine Tree's 2002 US debut, In Abstentia, had already laid most of the groundwork. For the middle-aged British quartet led by Steven Wilson, '70s rockers like Rush and Yes (with whom the group toured after the album's release) never went out of style but instead left behind grandiose scriptures to be studied for all of eternity. So while tighter and more efficient in spots ("Shallow," "Halo"), Porcupine Tree's Deadwing faithfully keeps the technically proficient epics coming, peaking with multi-tentacled 12-minute "Arriving Somewhere (But Not Here)." --Aidin Vaziri