The British Phonographic Industry (BPI) has warned it may sue people who swap songs on the internet illegally.
The trade group's director general, Andrew Yeates, said it was hoping to encourage new, legitimate services.
"We want to increase awareness of the legal implications of file-sharing. If these are not working, there has to be a degree of enforcement," he said.
The BPI said the "disturbing increase" in piracy was making legal action against users "increasingly likely".
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