Xue Shi Ling (born 薛仕凌; pinyin: Xuē Shì Líng), also known as MC40 is a Taiwanese-born Canadian musician, songwriter, lyricist, actor, and television presenter. He is a member of the Taiwanese hip hop band Da Mouth, with DJ Chung Hua, Harry, and Aisa.MC40 usually writes most of Da Mouth's lyrics on the album and is considered one of the best and fastest rappers in Taiwan with his multi-language rapping ability.