Todd Gilchrist editor Directed by Neo Sora, “Ryuichi Sakamoto: Opus” records the final performance of its namesake composer and musician prior to his death from cancer in March 2023. Per Sora, Sakamoto’s son, “Opus” is less a documentary than a concert film, capturing 20 tracks — electronic, orchestral, and everything in between — from his multifaceted career as they’re played on the piano in crisp black and white, in lighting that transitions from night to day and back to night.