Indie-rock band flipturn is ascendant. The Fernandina-founded, now-Jax-based quintet is probably the biggest Jacksonville-music success story since Black Kids blew up in the early aughts.  Watch flipturn, as well as performance videos of other local and nationally touring artists on our NPR Live Sessions Page On the strength Shadowglow, their debut for unimpeachably cool boutique label Dualtone (Shovels & Rope, …