In a possible preview of what's to come on their ninth studio album, Green Day performed a punchy new pop-punk song called 'Carpe Diem' at a club show in San Francisco last week.

Frontman Billie Joe Armstrong introduced the track by saying, "This next song's about f---ing being alive, every single one of us." The song revealed a catchy chorus in which Armstrong, Tre Cool and Mike Dirnt seemed to sing, "Carpe Diem, a battle cry / Aren't we all too young to die? / Ask the reason and no reply / Aren't we all too young to die?"

We're not sure how long they've been working on 'Carpe Diem,' but the song sure sounds like it's fully realized and ready to record. It sounds like something that might be blasting from every radio sometime next year. The band also reportedly played other new songs at the San Francisco concert, including 'Nuclear Family.'

Green Day have spent much of the year working on the follow-up to 2009's '21st Century Breakdown.' They've been playing shows to test out some of the new material for a few months. An August show included a tribute to Amy Winehouse called 'Amy.'

Watch Green Day Perform Their New Song 'Carpe Diem'