“Some bands make their journey to the Fountain of Rockness to take a sip or two; others merely to gargle. But the Hard Quartet dip their four sets of lips into those waters and drink deep. They gather together for an indie-rock supergroup of kindred spirits, resulting in a shaggily delightful album of casual guitar kicks. In this corner: Stephen Malkmus, from Pavement and the Jicks. In that one: Ma”