Echoes is a double-CD collection of some of Pink Floyd's best songs. It's also a fascinating document of the band's history. They began life as Syd Barrett's phantasmagoric plaything before clasping the wings of Icarus and ascending toward the sun on an epic space-rock odyssey, eventually turning left once they reached the dark side of the moon and burning up on reentry, crash-landing on every earthlings' home hi-fi. And it's all here–30 years of the Floyd's awesome back catalog trimmed down to two handsome CDs.