Legendary Innovation Returns. More than fifty years ago, John D’Angelico and John D’Addario’s chance meeting resulted in the invention of the world’s first modern round wound electric guitar string, the zinc-coated Bethanized™ Steel. Its sound was unrivaled in fullness, volume, and brightness. Its tone is featured on some of the greatest records of all time. But the closing of the Bethlehem Steel plant in the ‘60s put an abrupt end to its production, leaving its sound unmatched for over half a century. Today, their legendary innovation returns in the form of Electrozinc| a zinc-coated round-wound electric guitar string from D’Angelico, engineered by D’Addario.