The International Federation of the Phonographic Industry (IFPI) said the research was "flawed and misleading".
Music industry group the British Phonographic Industry (BPI) said the sites infringed copyright on a "significant scale".
The British Phonographic Industry (BPI) has written to the party's leader Loz Kaye to request the proxy's removal.
Meanwhile sales of CD albums rose by 5.6% in the UK last year, the British Phonographic Industry (BPI) reported.
BBC: NEWS | Entertainment | Downloads outsell DVDs and vinyl
According to the International Federation of the Phonographic Industry (IFPI), Mexico is the 16th largest digital music market in the world.
The British Phonographic Industry (BPI), which acts on behalf of rights holders, wants ISPs to prevent access to Fenopy, H33t and Kickass Torrents.
These spiralled into more DDoS attacks on copyright companies themselves, including websites for the International Federation of the Phonographic Industry and the British Phonographic Industry.
The International Federation of the Phonographic Industry, a trade association, believes that digital music sales will account for 25% of all recorded music sales by 2010.
Figures collated by the BPI (British Phonographic Industry) show that in 2011, 177.9m singles were sold in the UK with more than 99% sold as digital tracks.
BBC: Elton John Diana tribute tops best-selling single chart
Despite being the world's second largest economy, China ranks 20th globally in terms of recorded music revenue, according to the I nternational Federation of the Phonographic Industry (IFPI).
Much of the slump was down to "particularly poor" sales in the last two weeks of March, according to UK music industry body the British Phonographic Industry (BPI).
BBC: NEWS | Entertainment | Top albums fail to stop sales dip
In the UK, the British Phonographic Industry (BPI) took action to the courts, obtaining a court order to force internet service providers to block access to file-sharing site The Pirate Bay.
The British Phonographic Industry (BPI) told BBC News Online there was "an element of truth" in the survey's findings, but that it was "disingenuous" to suggest downloading could boost album sales.
Although a similar pan-European proposal was defeated earlier this month, few believe that the issue is dead, particularly given the International Federation of the Phonographic Industry's claim last Thursday that 2008 will be the year of greater ISP responsibility.
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