In a move that had shades of Kiss' simultaneous release of four solo albums, in the final months of 2012 Green Day issued three full-band albums, each, in Kiss-like fashion, emblazoned with the face of a different member. The wide variety of music on the discs, combined with the whimsical packaging, made the whole thing feel more ambitious, and also more lighthearted, than the two concept albums that preceded it. Either way, the release of ¡Uno!, ¡Dos! and ¡Tré! – on September 21st, November 9th and December 7th, respectively – was another definitive step forward for the band. "We are going into the unknown," Armstrong said to Rolling Stone prior the release of ¡Uno! "I don't know what's going to happen."