A US lawsuit has claimed Sony Music Entertainment cheated American Idol contestants including Kelly Clarkson and Carrie Underwood out of at least 10 million US dollars (£6 million) in royalties.
The lawsuit was filed in New York by 19 Recordings, a music company founded by Idol creator Simon Fuller.
The lawsuit says 19 discovered the royalty issue from two separate audits of Sony's records.
Other artists named in the suit include Clay Aiken, Chris Daughtry and Jordin Sparks.
Lawyer Richard Busch, of the Nashville, Tennessee, firm King & Ballow, says the legal action was necessary to protect the rights of 19's artists.
A Sony spokeswoman said she had no comment on the lawsuit.