The rich universe of these prog rock virtuosos offers plenty of fruitful side trips. Stretch out with the complex harmonies and tumbling instrumentation of shape-shifting 1974 epic “Ritual (Nous Sommes Du Soleil).” Indulge in the keyboard wizardry of Rick Wakeman's “Catherine of Aragon.” And embrace the '80s with the stacked harmonies, gleaming synths, and monster guitar sound of “City of Love.”