The makers of the new musical drama about Jimi Hendrix, “Jimi: All Is By My side” took a potential obstacle — the Hendrix estate’s refusal to grant access to any of his music — and turned it into an opportunity. Writer-director John Ridley’s film focuses on the year before Hendrix exploded into superstardom, when he was still honing his persona and his sound in London. Andre Benjamin is ideally cast. I dug it. My RogerEbert.com review.