Rostam Batmanglij has been inching into the spotlight for years — first as one-half of the back-burnered, revisited synth-pop duo Discovery (with Ra Ra Riot's Wesley Miles); then as a sonic architect and style editor behind Vampire Weekend's English dramas and Oxford commas; and finally as the ivories-tinkling lily gilder on I Had a Dream That You Were Mine, 2016's Rat-Packed partnership with The Walkmen's Hamilton Leithauser, and the first of many albums that bear Rostam's stamp to also wear his name. Nine months before that deliverance, he announced he was leaving Vampire Weekend in a no-mincing declaration of independence ("My identity as a songwriter and producer, I realized, needs to stand on its own"), and one year later he delivered on the promise. September debut Half-Light (Nonesuch) is part fantastical aural playground, part flying-colors demo-reel C.V. and all whimsy-chasing one-man symphony. Supporting beams "Bike Dream," "Never Going to Catch Me" and "Rudy" whisk up a slurry of head-spinning, breath-catching pleasures, thickening half-remembered romances via circular/recurring trains of thought presented in a reverie-curtained proscenium. Sam Buck opens. Tickets $15 in advance, $17 day of show. At 9 p.m. Tuesday. Gasa Gasa, 4920 Freret St., (504) 338-3567; www.gasagasa.com.