When Cave In declared their hiatus three and a half years ago, no one knew what to expect for the quartet’s future. Everyone knows that a hiatus is more often than not a prelude to the breakup. Not so, however, for Cave In, who has just released the dynamic, raging Planets of Old on Hydra Head. Listening to it, it’s hard to believe that the band was apart for so long. The songs are as tight as ever, and the lyrics spin dark, haunting tales against the heavy, ethereal sound scape of the EP.