The embattled music sharing service Napster will be facing a new barrage of legal attacks from EMusic. On Wednesday, EMusic filed a copyright infringement suit against Napster accusing it of unfair business practices.

EMusic which bills itself as "the premier source for legitimate MP3s" pays artists for each music download off its subscription-based web site. EMusic is accusing Napster of unfair competition because Napster's business is based upon illegitimate use of copyrighted material.