Guitarist Jeff Parker, 57 years old and with a few dozen albums out in the world, is having a moment. Some of that energy comes from his association with the International Anthem label, both as a leader and a sideman. And Parker’s playing style—probing and melodic, exploratory yet always coherent—endears him to the jazz-curious and old heads alike. In one sense it found Parker in the most traditional of settings, playing small-group improvised jazz in an instrumental configuration that goes back to the form’s earliest days. These are mellow improvisations, easy to zone out to, but they’re also playful and surprising.