J Mascis (b. 1965) is an American musician and songwriter, probably best-known as the singer, guitarist, and songwriter for Dinosaur Jr., though he has also occasionally worked as a producer and film composer. Born Joseph Mascis on 10th December 1965 in Amherst, Massachusetts, United States, in the early 1980s he founded the short-lived hardcore group Deep Wound with his high school friends Lou Barlow and Scott Helland.

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