MusicXML scores for euphonium by Jay Rock

Johnny Reed McKinzie Jr. (born March 31, 1985), better known by his stage name Jay Rock, is an American rapper. Born and raised in Los Angeles, he signed with local independent label Top Dawg Entertainment (TDE) in 2005. He secured a major label joint venture deal with Warner Bros. Records and Asylum Records to release his 2008 debut single, "All My Life (In the Ghetto)" (featuring Lil Wayne and will.i.am). Failing to chart, the mergers fell through and Rock departed from both of the latter labels shortly after. He then signed with Missouri rapper Tech N9ne's label Strange Music in a joint venture deal with TDE in 2011.

Preceded by ten mixtapes for TDE, Rock's long-delayed debut studio album, Follow Me Home (2011), was released to moderate commercial reception and critical praise. It was supported by the aforementioned single, as well as "Hood Gone Love It" (featuring Kendrick Lamar). He departed Strange Music in 2014 and released his second album, 90059 (2015) the following year. He once more signed a joint venture with Interscope Records to release his third album Redemption (2018), which was met with critical acclaim and peaked at number 13 on the Billboard 200. Its lead single, "King's Dead" (with Kendrick Lamar, Future, and James Blake), was shared with the Black Panther soundtrack, peaked at number 21 on the Billboard Hot 100 and won Best Rap Performance at the 61st Annual Grammy Awards.

Apart from his solo career, Jay Rock is also known as a member of the now-defunct hip hop supergroup Black Hippy, alongside fellow West Coast rappers and TDE labelmates Kendrick Lamar, Schoolboy Q, and Ab-Soul.