Young internet pop stars are blooming in China, where they record their music with just a laptop, headphones and a lip-mike. Xiang Xiang is the 21-year-old at the top of the charts. Her Song of Pig has notched up a billion downloads from admirers in China, Singapore and Malaysia, but the downloads are all free. Why free? “It’s purely a kind of communication. I get feedback and suggestions or comments on my work and then I can make changes.”