This is the RS article I saw refering to ring tone sales:
As the music industry continues to struggle with shrinking profits, layoffs and consolidation, cell phones have suddenly emerged as a financial jackpot. Customized ring tones -- synthesized song clips that play instead of a normal ring -- now earn billions of dollars for artists, record labels and the cell-phone industry. Add improved phones and features to the mix, say some record executives, and music via mobile may outpace what's now being sold through retail and the Internet.
"This is the most explosive growth area to come," says Craig Kallman, co-president of Atlantic Records, which had a big ring-tone hit last year with Sean Paul's "Get Busy." "If you can distribute through a cell phone, you have a broader platform than what's ever been seen before."
Worldwide, the ring-tone market is already huge: Users of cell phones (primarily ages sixteen to twenty-five in Asia and Europe) spent about $3 billion in 2003 on hits such as 50 Cent's "In Da Club" and OutKast's "Hey Ya!" along with catalog favorites such as Lynyrd Skynyrd's "Sweet Home Alabama." That's ten percent of the world's music market, and far more than the $100 million to $200 million that's expected to be spent this year on legal Internet downloads.
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http://www.rollingstone.com/news/story/_/id/5937019