Side-long concept pieces, walls of Mellotrons, keyboardists in capes…such were the glories of progressive rock. And behind it all were a stack of wildly creative prog-rock albums that still hold a potent thrill of discovery. The reverberations are still there whenever a modern band takes chances with instrumentation or reaches beyond a singles-length track. But here we salute the original 70s heyday of prog rock, with a couple of late-60s and early-80s cornerstones. All of it demonstrates how much of a journey a 40-minute vinyl album could be.

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