The provided text is an excerpt from a Wikipedia article detailing the life and career of Mark Arm, an American musician best known as the vocalist for the grunge band Mudhoney. The source offers biographical background, noting his birth name, date, and location, as well as his education and current occupation as the manager of the Sub Pop warehouse. It extensively charts his early career beginning in 1980 with the band Mr. Epp and the Calculations, followed by his involvement in Green River, one of the earliest grunge groups. The article then focuses on the formation and ongoing history of Mudhoney, including their album releases and relationship with the Sub Pop and Reprise labels, before listing his numerous solo and side projects such as Bloodloss and The Monkeywrench.