Las Vegas four-piece Panic at the Disco changed radically between their 2005 debut album "A Fever You Can't Sweat Out," which made them poster boys for the emo scene, and 2008's "Pretty. Odd.," where they paid homage to The Beatles and "Ogden's"-era Small Faces. Their set in Summer Sonic's vast Marine Stadium saw them indulge this 1960s whimsy with tight melodies, acoustic and electric guitars and tinkly piano, introducing their hit "Nine in the Afternoon" in Japanese (after being taught how to say it by The Japan Times).

The band are currently working on new material and hope to start recording album three at the end of the year. Founding duo Ryan Ross (guitar) and Spencer Smith (drums) say it will be different again, but even they don't know what to expect just yet.

Have you played at Summer Sonic before?