Anthony Child, the British techno artist better known as Surgeon, released his first club hits while living in a Birmingham share house. “Atol” and “Magneze,” the standout tracks from his self-titled 1994 debut, were the world’s introduction to a style that would later become known as the “Birmingham sound,” a raw, percussive brand of techno that would soundtrack dance floors for the next decade. More than 20 years later, “Atol” and “Magneze” remain the best-known tracks in Child’s substantial discography, which by now includes eight albums and dozens of EPs. Among techno tunes this hard, anthems are rare. Child’s first record had two.