The IFPI has announced nearly 2,000 new cases against file-sharers across the UK.
Legal action is being extended to Portugal for the first time.
In a development that could be mirrored in other EU countries, thousands of file-sharers in Denmark could now find their online connections cut off by their internet service providers (ISPs).
In Italy, a series of raids against individual file-sharers and servers in the past fortnight has led to the seizure of more than 70 computers in the search for evidence. Each server had around a thousand users and 30TB of shared music.
The latest wave of cases, covering actions launched today or brought about in recent months, takes the total number of legal actions against uploaders to more than 5,500 in 18 countries outside the US.
These actions, a combination of criminal and civil suits, are aimed at 'uploaders' – people who have put hundreds or thousands of copyrighted songs on to file-sharing networks and offered them to millions of people worldwide without permission from the copyright owners.
Today's actions target users of all the major unauthorised p2p networks, including FastTrack (Kazaa), Gnutella (BearShare), eDonkey, DirectConnect, BitTorrent, Limewire, WinMX, and SoulSeek.
The actions are being launched in Austria, Denmark, Finland, Germany, Hong Kong, Iceland, Italy, Portugal, Sweden and Switzerland.