Stereolab's catalog is full of hidden passageways and loopy detours. “How to Play Your Internal Organs Overnight”—originally from Music for the Amorphous Body Study Center—is a woozy swirl of voice and strings. The exhilarating “Mass Riff” flips unexpectedly from ‘60s pop to slinky funk, and “Neon Beanbag,” sprinkled with dissonant pixie dust, bobs between easy and uneasy listening.