t from the music industry is expected to make mobile music the most pop- ular mobile consumer application. Large music publishers, such as EMI and Warner Music, are moving into the mobile music markets due to the closed nature of cellular networks, which presents a more secure environment for intellectual entertainment property. One of the reasons the mobile music market began to develop is that music publishers became aware that they could convert songs into ringtones, which could be used on mobile phones to alert cus- tomers to incoming calls or messages. Combined with falling prices of handsets, new music applications and highly visible cobranded devices will create even more opportuni- ties for mobile content services and drive this market to grow. Warner Mobile Music Streaming Jukebox (a demo is available at http://wireless. wmg-is.com/javadotcom/index.html) is an innovative service that gives you access to ringtones, lets you view and download artist images, provides updated information about the artists, and has exclusive offers. It also allows you to stream actual music clips to your mobile device. Tools like the java.com Ringtone ReMixer (www.java.com) allow you to create custom mixes of your favorite hits on your PC browser and then send them to your mobile handset, so you can compose your own ringtones and caller IDs. Motorola has introduced its iRadio service, a service that allows users to access Inter- net radio and music files through mobile phones in their cars, computers, or home audio systems. iRadio will use two-way Bluetooth technology and a mobile phone to offer lis- teners continuous entertainment. A user will be able to start playing a song in his or her car, pause it, and continue listening on a home audio system. According to the Jupiter Research (www.jupiterresearch.com) study, "Mobile Music: Ringtones, Ring-backs & Full-tracks (second edition)," mobile music revenues are expected to exceed US$9.3 billion by 2009 due to the increased popularity of full-track downloads and ringtones. Ring