Dinosaur Jr is an American rock band. The band was formed in 1984 in Massachusetts. The band stopped playing in 1997 but came back together in 2007. The people in the band right now are J Mascis, Lou Barlow and Murph. The band has recorded many albums over the years that were very important to rock music. Some of these albums are "You're Living All Over Me", "Green Mind" and "Beyond".