The newly-updated MySpace has already been accused of streaming independent music without permission.
It relaunched in late 2012 after being bought out last year from investors including Justin Timberlake, who relaunched his singing career on the site last week.
Up to 100 labels have found their music streaming illegally on the site, because its deal with indie label representative Merlin had expired in 2011.
They include three of the biggest independent labels: Beggars Group (which itself represents Rough Trade, XL and others), Domino and Merge.
"While it's nice that Mr Timberlake is launching his service on this platform, and acting as an advocate for the platform, on the other hand his peers as artists are being exploited without permission and not getting remuneration for it," said Charles Caldas, chief executive of Merlin in an interview with the New York Times.
MySpace responded to say it wouldn't renew a contract with Merlin, but that any songs remaining on the site were "likely uploaded by [other] users" and would be removed if the label sends a takedown request.
The new MySpace impressed many people with its fresh redesign, but a lack of user activity and the range of social alternatives which cropped up in its absence means that many people have no interest in the new MySpace.
Have you tried the new MySpace? What do you think? Do you remember using it in the old days? Let us know in the comments.