"The last two albums, American Idiot and 21st Century Breakdown, sort of bookend each other, and it's the end of that era. And I think with writing these three albums we just started writing songs, just getting back to basics, more stripped-down rock and roll. [And] we just started noticing the changes that were happening, so ¡Uno! is more of a power-pop record, ¡Dos! is more of a dirty, party, garage record, and ¡Tré! is sort of this epic ending of the whole thing... So it's kind of like going around the world in 37 songs with Green Day."