All about Billie Joe Part 2

Billie Joe is also a guitarist and vocalist for the punk rock band Pinhead Gun Powder and provides lead vocals for Green Day's side project Foxboro Hot Tubes.

Apart from working with Green Day and side-band Pinhead Gun Powder, Armstrong has collaborated with many artists over the years. He has co-written for The Go-Go's ("Unforgiven") and former Avengers singer Penelope Houston ("The Angel and The Jerk" and "New Day"), co-written a song with Rancid ("Radio"), and sung backing vocals with Melissa Auf der Maur on Ryan Adams' "Do Miss America" (where they acted as the backing band for Iggy Pop on his Skull Ring album ("Private Hell" and "Supermarket"). Armstrong has produced an album for The Riverdales. He has also been confirmed to be part of a side project called The Network, which released an album called Money Money 2020. Money Money 2020 was released on Adeline Records, a record label co-owned by Armstrong. Armstrong also provided lead guitar and backing vocals on 3 songs for The Lookouts' final extended play IV (1989).

Armstrong's first guitar was a Cherry Red Hohner acoustic, which his father bought for him. He then received his first electric guitar, a Fernandes Stratocaste rthat he named "Blue" when he was eleven. His mother got "Blue" from George Cole who taught Armstrong electric guitar for 10 years. Armstrong says in a 1995 MTV interview, "Basically, it wasn't like guitar lessons because I never really learned how to read music. So he just taught me how to put my hands on the thing." Cole bought the guitar new from David Margen of the band Santana. Cole gave Armstrong a Bill Lawrence Humbucking pickup and told him to install the pickup in the bridge position. After the pickup was destroyed at Woodstock '94, Armstrong then used a Duncan JB model. "Armstrong fetishized his teacher's guitar, partly because the blue instrument had a sound quality and Van Halen–worthy fluidity he couldn't get from his little red Hohner. He prized it mostly, however, because of his relationship with Cole, another father figure after the death of Andy". He toured with this guitar from the band's early days and still uses it to this day."Blue" also appears in a number of its music videos such as "Longview", "Basket Case", "Brain Stew/Jaded", "Hitchin' a Ride", and most recently in "Minority".

Today, Armstrong mainly uses Gibson and Fender guitars. Twenty of his Gibson guitars are Les Paul Junior models from the mid- to late-1950s. His Fender collection includes: Stratocaster, Jazzmaster, Telecaster, a Gretsch hollowbody and his copies of "Blue". He states that his favorite guitar is a 1956 Gibson Les Paul Junior he calls "Floyd". He bought this guitar in 2000 just before recording their album Warning.

Armstrong also has his own line of Les Paul Junior guitars from Gibson, modeled closely after "Floyd", Armstrong's original 1956 Les Paul Junior.

He plays several other instruments as well. He recorded harmonica and mandolin parts in the past, piano parts on 21st Century Breakdown, and plays drums live from time to time.