Sub Pop is a record label founded in 1986 by Bruce Pavitt and Jonathan Poneman in Seattle, Washington. Sub Pop achieved fame in the late 1980s for first signing Nirvana, Soundgarden, Mudhoney and many other bands from the Seattle music scene. They are often credited with taking the first steps toward popularizing grunge music, and have continued to achieve critical and commercial success in the new millennium, with popular bands such as Fleet Foxes, Dinosaur Jr., Foals, Beach House, The Postal Service, Flight of the Conchords, No Age, Wolf Parade and The Shins on their roster. In 1995 the owners of Sub Pop sold a 49% stake of the label to the Warner Music Group.

The origins of Sub Pop can be traced back to the early 1980s when Bruce Pavitt started a fanzine called Subterranean Pop that focused exclusively on American independent record labels. Pavitt undertook the project in order to earn course credit while attending Evergreen State College in Olympia, Washington. By the fourth issue, Pavitt had shortened the name to Sub Pop and began alternating issues with compilation tapes of underground rock bands. The Sub Pop #5 cassette, released in 1982, sold two thousand copies. In 1983, Pavitt moved to Seattle, Washington and released the ninth and final issue of Sub Pop. While in Seattle, he wrote a column for local newspaper The Rocket titled "Sub Pop U.S.A.", a column he ended in 1988.

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J Mascis ( /ˈmæskɪs/ MASS-kiss; born Joseph Donald Mascis on December 10, 1965) is an American musician, best known as the singer, guitarist and songwriter for Dinosaur Jr.. In 2011, he was ranked 86th in Rolling Stone's list of the 100 greatest guitarists of all time.

Mascis was born in Amherst, Massachusetts, the son of an orthodontist. His family name is Italian, from the province of Foggia (region Puglia) in the south of Italy. His mother is an avid golfer.

Mascis formed the short-lived hardcore group Deep Wound with Lou Barlow, Scott Helland, and Charlie Nakajima in the early 1980s. He started out on drums, but moved to guitar when he went on to found Dinosaur Jr. with bassist Barlow and drummer Emmett Jefferson "Patrick" Murphy (aka "Murph") in 1984 and achieved national success. His vocals have been described as "Neil Young-like" and his guitar riffs as "monolithic." Mascis dismissed Barlow from Dinosaur Jr. in 1989 and over the next eight years recorded several more Dinosaur Jr. albums, including the 1996 acoustic solo album Martin + Me.