Right out of prison at 25, Lyfe Jennings, wielding an acoustic guitar, cut a record one critic compared to R&B legends as wide-ranging as Gil (“The Revolution Will Not Be Televised”) Scott-Heron and D’ (“Brown Sugar”) Angelo. Hey, no pressure. In the video for Jennings’ “Must Be Nice,” he was seen leaving prison, a guard behind him warning, “He’ll be back.” He did go back. In 2010. But Lyfe’s been out for a while now, hitting the road now and then to reprise his truth tales and seduction songs.