Is Richard Wagner a genius or a monster? Is his music a remedy or a poison? As the opera world celebrates his 200th birthday, Wagner's legacy remains the source of fiery debate. To mark his bicentenary, the KT Wong Foundation takes you to an exciting tour of the man and his music, in the company of those who know Wagner best: singers, conductors, directors, composers. In this, the second of the Wagner Interviews, we speak with compose Guo Wenjing.