MASS OF THE FERMENTING DREGS (マス オブ ザ ファーメンティング ドレッグス) is an alternative rock trio formed in Kobe, Japan in 2002, later reforming in 2015. 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. They were signed to the Japanese indie rock record label AVOCADO Records from the release of their self-titled EP in January 2008. The band announced their disbandment on September 1, 2012. The final lineup was 宮本菜津子 (Miyamoto Natsuko) (Vocals/Bass) and 吉野功 (Yoshino Tsutomu) (Drums/Vocals).