FIGURE 4.1 THE EVOLUTION OF DIGITAL SOUND RECORDING SALES (REVENUE IN BILLIONS) Data from: Recording Industry Association of America, Annual Year-End Statistics Note: The year 1999 is the year Napster arrived, and the peak year of industry revenue. In 2011, digital product revenue surpassed physical product revenue for the first time. In 2013, digital download revenue dropped for the first time as digital subscriptions and streaming gained in popularity. Synchronization royalties are those from music being licensed for use in television, movies, and advertisements.