Over $13 billion will be generated by all forms of mobile music by 2011, according to a forecast by research firm Informa Telecoms & Media. A large proportion of this revenue will still be derived from ring-tones, with ring back tones starting to make significant contributions to this growth. The steady growth in full track downloads (FTD) and streaming audio services are also helping to raise the profile of the mobile phone as a credible music device, according to Informa.

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