It would be misleading to call ARJUN either a power trio or a jazz-fusion outfit, although they draw liberally from both disciplines. Improvisation is at the core of their approach, and the eight jams that comprise the Scotty Hard-produced Gravity are indeed weighty and, at times, dense, but to box them in would be to shortchange them. For one thing, melody rides atop everything they play. Even in the thick of their most complex, groupthink moves, Eddie Arjan Peters (guitar), Andre Lyles (bass) and Lamar Myers (drums) lock in to a groove and work it to the bone and something memorably hummable is never far away. “Prince,” the funk-fest of an opener, spotlights Peters at his most lyrical, slipping seamlessly from tempo to tempo and gliding across time signatures, without ever losing sight of the root of the song. Myers, when called upon, is all about precision timekeeping but then, before you even know he’s done it, he slips into a freewheeling rhythm that swings so gently and coolly, and alters the mood so subtly. And Lyles is the tether, holding the bottom when required and driving when he can. (He’s a monster on the successive “Crossroad” and “Endless Again.”) There are noteworthy guests: Jeff Coffin’s flute gives the already soaring “Run” even more of an orchestral grandeur than it was born with, and Cory Henry (Snarky Puppy) lends organ fills to “Ascent” that simultaneously suggest Traffic at their peak and a move into classic soul territory that they’d be wise to explore further. For three guys, ARJUN makes some pretty colossal statements on Gravity.