Dinosaur Jr. is an American alternative rock band. They were formed as Dinosaur in 1983 in Amherst, Massachusetts by J Mascis (guitar and vocals) and his high school classmate Lou Barlow (bass guitar). Shortly afterwards, Murph (Emmett Patrick Murphy, drums) joined them. They changed their name following the release of their debut, Dinosaur (1985), due to another band called The Dinosaurs.
In 1987, Dinosaur Jr. signed to SST Records and with them they released what is often considered their best album, You're Living All Over Me (1987), as well as Bug (1988). They never had much commercial success, but gained something of a cult following and became known for their very loud concerts. They were championed by Sonic Youth, who helped them get signed to SST. Dinosaur Jr.'s songs were melodic, fairly simply structured and covered in guitar noise.