Mass of the Fermenting Dregs (マス オブ ザ ファーメンティング ドレッグス, Masu obu za Fāmentingu Doreggusu), stylized as MASS OF THE FERMENTING DREGS, is a post-hardcore/shoegaze trio formed in Kobe, Japan in 2002. They are also popularly known by a shortened form of their name, Masu Dore (マスドレ). They are known for a tightly arranged, guitar-driven style, melodic pop vocals and a high-energy stage presence at their live events.