“Proof of Life” by Joy Oladokun (Amigo/Verve Forecast/Republic) Joy Oladokun draws on a range of influences, but trying to pin her down with labels is mostly a waste of time. Better simply to acknowledge her as one of the most appealing artists working in the music scene these days. Oladokun, a Black lesbian singer-songwriter who lives in East Nashville and has been embraced by the Americana world, delivers her warmest and most cohesive work to date on “Proof of Life,” a 13-song album that creates an aura of positivity and sustains it.