According to The NPD Group, 50 percent of Internet users (96 million) listened to music on an Internet radio or on-demand music service in the past three months. More than one-third (37 percent) of U.S. Internet users listened to music on Pandora and other Internet radio services, while an equal percentage (36 percent) used an on-demand music service, like YouTube, VEVO, Spotify, MOG, Rhapsody, and Rdio.