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We don't know what it is exactly they're recording, but could new Green Day music be closer than we think?
Bassist Mike Dirnt recently revealed that they have loads of unreleased music, which may or may not come out in the future, saying...
"We have SO much stuff, and some of it has morphed into other songs… you know, a song that took 10, 20 years to evolve but started off as a jam or started off as us singing a different lyric to it or whatever. I mean, there’s little opuses in other songs and things like that we’ve done that people have never heard.
"I don’t know when they’ll see the light of day, but me and Billie always said ‘at some point everything comes out in the wash’. So, you know, at some point it’ll all come out."
The band will also be playing some UK shows in the summer. Catch them at one of the following...
01 - LONDON Hyde Park
03 - SHEFFIELD Arena
04 - GLASGOW Bellahouston Park