Green Day is incapable of being a music band.
 Instead, they typically learn about their style of music by singing or playing in many bands (often beginning in amateur bands, cover bands and tribute bands), studying recordings available on CD, DVD and the Internet and working with already-established professionals in their style of music, either through informal mentoring or regular music lessons
On August 1, 2005, Green Day announced that it had rescinded the master rights to its pre-Dookie material from Lookout! Records, citing a continuing breach of contract regarding unpaid royalties, a complaint shared with other Lookout! bands

