With the help of an enemy-turned-ally, Joel Suzuki has returned to the magical, musical island of Spectraland. He's ready to learn the licks and riffs he needs in order to stop his nemesis from conquering all of existence.

But after an unexpected betrayal, that plan is no longer practical-if it was ever possible. Joel's only choice is to embark on a hazardous journey through alternate realities, gathering the energy of multiple Songshells through a perilous process that jeopardizes not only his own life, but the integrity of the multiverse itself.

Meanwhile, another threat has emerged as forces from faraway worlds conspire to destroy both Spectraland and Earth. Faced with foes on all sides and racing against time, Joel must find a way to complete his mission while dealing with romantic distractions, fading memories, and-maybe the biggest danger of all-the corrupting influence of his own growing power.