"This article is a beginner’s guide to understanding the ‘musical scales’ of cyberwar. As such, it addresses what constitutes a use of force in cyberspace and how states may lawfully respond. Understanding the legal confines of offensive and defensive cyber operations is a burgeoning area of study. In fact, as the former legal advisor to the U.S. State Department, Harold Koh, famously remarked at U.S. Cyber Command in 2012: “How do we apply old laws of war to new cyber-circumstances, staying faithful to enduring principles, while accounting for changing times and technologies?"