There's a deep-chill variety of ambient that avoids beat and melody in favor of sonic purity and invention. At worst, it's vacuous plink-a-plonk. At best, it's harrowing and ethereal. Soil, the seventh in a series of projects by the Instinct Ambient label, features New York maestro Terre Thaemlitz trafficking the latter: His compositions coddle and poke with enough bass to turn any room into a cosmic tuning fork. Don't come searching for catchy ditties - this stuff has all the hummability of your coolest dreams.