Opio Brings New Album, ‘Sempervirens,’ to BackBar

East bay rapper Opio has gray hairs winding through his twisty locks. The tenured spitter has been a pillar in the Bay Area underground since the early ’90s, operating on his own and with the Souls of Mischief as part of the hallowed indie hip-hop collective, Hieroglyphics. With his most recent project, Sempervirens,…