He has returned to traditional American roots forms, collaborating with Ricky Skaggs. He has played with the Grateful Dead. He has fused the plunk and dazzle of twentieth-century modernist classical composition to singer-songwriter emotional inquiries. He has scored films. He has performed with symphony orchestras. If the sound of an arrogant air-conditioner or a stretch of rude playing caught his ear, he has entered the hallowed doors of the conservatories of punk. So when Hornsby describes Absolute Zero, his new album, as “a compendium of what I like and moves me,” don’t expect perhaps a thing or two new. Prepare for a multi- faceted ride.