Dinosaur Jr. is an American alternative rock band, notable for their distinctive fusion of punk, noise rock, and melodic guitar solos. Formed in 1984, the band originally consisted of J Mascis (vocals, guitar), Lou Barlow (bass, vocals), and Murph (drums). Their raw sound, marked by Mascis's frenzied guitar solos and emotive vocals, has been influential in shaping the grunge and indie rock movements. Noteworthy albums include their 1987 release "You're Living All Over Me" and the 1994 "Without a Sound", displaying their significant contribution to the alternative rock genre.