A major US music industry body has joined other businesses in seeking to sue video-sharing website YouTube.
Several companies are suing YouTube over copyright issues
The National Musical Publishers' Association says some songwriters are not being properly compensated when their music appears on the site.
But YouTube says it stays within the law by immediately taking down clips found to be in breach of copyright.
The legal action has been combined with those of several other companies, including Viacom and Nickelodeon.
Other organisations suing YouTube include the Football Association Premier League, Paramount Pictures and Comedy Central.
Chief executive of the National Musical Publishers' Association (NMPA), David Israelite, said the body was "very concerned about YouTube's approach to copyright".
He added that the body was joining the case "to protect the interests of music publishers and songwriters, whose creative works are being used without permission or compensation by YouTube".
The combined case will be heard in New York.