MTV runs a number of internet radio stations

Groups that signed the agreement included the Recording Industry Association of America, a recording industry trade group, and two major artists' trade unions, the American Federation of Television and Radio Artists and the American Federation of Musicians.

Artists' groups the Recording Artists Coalition, the Music Managers Forum and the National Academy of Recording Arts and Sciences also signed.

The two sides agreed to share control equally of SoundExchange, an organisation that tracks and distributes royalties from digital broadcasts.

SoundExchange made its first direct payment, of $5.2m (�3.5m), to artists and other copyright holders on 15 October.

Legal minefield

The growth of new media has opened up whole new areas of uncertainty in copyright law and led to some fierce legal contests.

The US music industry and internet broadcasters have called in an arbitration panel to decide on the size of web royalties for artists.

And in April, European Union ministers gave their final approval to new, EU-wide copyright laws aimed at curbing internet and hi-tech piracy.

Fighting for European royalties: the Corrs

The copyright directive, as the law is known, seeks to balance the interests of the music industry, artists and consumers.

It gives copyright owners permission to use encryption to block the duplication of copyright-protected works and to limit the illegal downloading of audio and video files from the internet.

Member states have 18 months to ratify and implement the directive.