The Hartnoll brothers defined UK techno in the early '90s, and their second album, with its squiggly 303 lines and soaring keyboard melodies, boasts the epic scale of the era's airplane-hangar raves. The hypnotic surge of "Impact (The Earth Is Burning)" and the mysterious, tunnel-driving "Remind" offer an invigorating fusion of acid, breakbeats, and trance, but the real stunners here are "Halcyon and On and On" and "Lush 3-2," examples of rave music at its most ethereal.