Just months after releasing his debut album on Daptone Records, London-via-D.C. soul singer-songwriter Jalen Ngonda is back with a brand new single, the bittersweet, Motown-inspired “Illusions.” A talented purveyor of time-warp soul a la Leon Bridges, Ngonda’s distinctive voice is his most valuable asset, a nimble falsetto that evokes explosive joy and eats high notes for breakfast. On “Illusions,” however, …