The band members of Rhode Island's "Lemonade Mouth" are offered a deal with agent Earl Decker who wants to take their ukulele and trumpet show to the top of the charts. Getting on to the music talent show American Pop Sensation, the five are sent viral on the internet when they scold the judges for being mean. However, some of their fans fear they are becoming too big to be an Indie rock sensation any longer, and that they have forgotten their roots.