"J.A.R." is a song by the American punk rock band Green Day. The song was a previously unreleased track from the Dookie sessions but it was later featured on the soundtrack to the movie Angus in 1995. The acronym stands for 'Jason Andrew Relva', a childhood friend of Green Day bassist Mike Dirnt. Jason Relva was born on November 16, 1972 and died at the age of 19 on April 18, 1992 as the result of injuries sustained from a car accident. Mike Dirnt wrote the song in remembrance of him.
In August 1995, the song reached number one on the BillboardModern Rock Tracks chart and spent 16 weeks on it. This song was worked on during the Dookie demo, but later removed on final track. The song peaked at number 22 on the Hot 100 Airplay chart.
PopMatters listed "J.A.R." as the ninth best Green Day song, commenting "It's a winner in its own right, and in a sense, its bubbling bass, buzzing chord crashes, and Tre Cool’s killer chorus drum beat is the Platonic ideal of a Green Day song."