Lovers of late great Japanese film composer, musician, actor and producer Ryuichi Sakamoto have long awaited the release of his posthumous album “Opus.” The collection of his works by Sakamoto were performed one final time on solo piano shortly before his death. He was already too ill to perform the whole set at once so recorded and filmed the works in a series of sessions at the legendary NHK 509 studio in Tokyo. Musical genius Sakamoto died just a few months later, in March last year, at the age of 71, after a long battle with cancer. “The project was conceived as a way to record my performa…