When he's not leading Dinosaur Jr., legendary indie-rock axe-wrecker J Mascis likes to keep himself busy with extracurricular projects. His latest is the instrumental power-trio Heavy Blanket, which also includes his old high-school friends Pete Cougar and Johnny Pancake. They'll release their self-titled debut soon. Below, listen to "Dr. Marten's Blues," which sounds like the product of a particularly righteous ...