Billie Joe Armstrong is an American singer, songwriter, musician, and record producer. He is best known as the lead vocalist, primary songwriter, and lead guitarist of the rock band Green Day, which he co-founded with Mike Dirnt in 1985. 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, The Network, The Longshot, and The Coverups. Armstrong developed an interest in music at a young age, and recorded his first song at the age of five. He met Dirnt while attending elementary school, and the two instantly bonded over their mutual interest in music, forming the band Sweet Children when the two were 14 years old. The band later changed its name to Green Day. Armstrong has also pursued musical projects including numerous collaborations with other musicians. In 1997, to coincide with the release of Nimrod, he founded Adeline Records to help support other bands, signing acts such as The Frustrators, AFI, and Dillinger Four. The record company later shut down in August 2017.