Book excerpt: Based on the critically acclaimed podcast that has broken down hundreds of Top 40 songs, Switched On Pop dives in into eighteen hit songs drawn from pop of the last twenty years--ranging from Britney to Beyoncé, Kelly Clarkson to Kendrick Lamar--uncovering the musical explanations for why and how certain tracks climb to the top of the charts. In the process, authors Charlie Harding and Nate Sloan reveal the timeless techniques that animate music across time and space.