"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.
Green Day is an American punk rock band formed in 1986 by lead vocalist and guitarist Billie Joe Armstrong and bassist Mike Dirnt.
 For much of the group's career, the band has been a trio with drummer Tré Cool, who replaced former drummer John Kiffmeyer in 1990 prior to the recording of the band's second studio album, "Kerplunk" (1991).
 Guitarist Jason White, who has worked with the band as a touring member since 1999, was an official member from 2012 to 2016.
The Servants were an indie band formed in 1985 in Hayes, Middlesex, England by singer-songwriter David Westlake.
 The band was the original home of Luke Haines.
21st Century Breakdown is the eighth studio album by American punk rock band Green Day.
 It is the band's second rock opera, following "American Idiot" (2004), and their first album to be produced by Butch Vig.
 Green Day commenced work on the record in January 2006 and forty-five songs were written by vocalist/guitarist Billie Joe Armstrong by October 2007, but the band members did not enter studio work until January 2008.
American Idiot is a sung-through stage adaptation of punk rock band Green Day's rock opera "American Idiot".
 After a run at the Berkeley Repertory Theatre in 2009, the show moved to the St. James Theatre on Broadway.
 Previews began on March 24, 2010, and the play officially opened on April 20, 2010.
 The show closed on April 24, 2011, after 422 performances.
 While Green Day did not appear in the production, vocalist/guitarist Billie Joe Armstrong performed the role of "St. Jimmy" occasionally throughout the run.
George Cole (born October 10, 1960) is an American music producer, composer, lyricist, vocalist, session musician, and guitarist.
 He fronts his own Gypsy jazz/Uptown Swing band and since early 2014 has been the guitarist for the David Grisman Quintet.
 Before his acoustic music endeavors, he played electric guitar for the pop rock band Beatnik Beatch and Big Blue Hearts.
 He played on Chris Isaak's platinum Forever Blue album.
 Cole is also a teacher, and his students include Billie Joe Armstrong and Mike Dirnt of Green Day; Ethan Roberts, and Danny Jones.
William 'Bill' Schneider (born June 17) is an American musician.
 He has played bass in the punk rock band Pinhead Gunpowder since 1990, as well as providing vocals and writing the lyrics to the song "Backyard Flames".
 He has also been in many other bands such as The Influents, Monsula and Uranium 9v, Sawhorse and The Skinflutes.
 Bill was worked as bass tech during the Nimrod era for Mike Dirnt, Green Day's and as guitar tech on their albums "Nimrod" and "Warning", American Idiot, 21st Century Breakdown, Uno Dos Tres, Revolution Radio and was their day to day manager from 2003-2012 for their "American Idiot" and 21st Century Breakdown tours through Uno Dos Tres.
 He also owned "Broken Guitars", a guitar shop in Oakland, California with Billie Joe Armstrong.
 Bill Still works on the sidelines with the band as well as in the studio.
Billie Joe Armstrong (born February 17, 1972) is an American musician, singer, songwriter and actor who is best known as the lead vocalist, primary songwriter, and guitarist of the punk rock band Green Day, which he co-founded with Mike Dirnt.
 He is also a guitarist and vocalist for the punk rock band Pinhead Gunpowder and provides lead vocals for Green Day's side projects Foxboro Hot Tubs and The Network.
Oakland Coffee Works is a coffee company founded by Billie Joe Armstrong and Mike Dirnt of the rock band Green Day.
 Focusing on sustainability, it is the first coffee company in the world to offer only 100% fully organic and compostable-packaged products.
Since 1991, some members of punk band Green Day have branched out past their "main band" and have started other projects with other musicians and have released full-length albums and several EPs.
 Notable related projects of Green Day include Billie Joe Armstrong's Pinhead Gunpowder (which also featured Green Day's other guitarist Jason White), The Frustrators in which Mike Dirnt plays bass, and The Network which many speculate has all three members of Green Day, although under stagenames.

Question: What band formed in 1986 by lead vocalist and guitarist Billie Joe Armstrong and bassist Mike Dirnt, Green Day or The Servants?
Answer: Green Day