Two former backup singers for the disco group KC & the Sunshine Band are suing bandleader Harry "KC" Casey, Rhino Records and Warner Music Group for breach of contract.

LOS ANGELES--Two former backup singers for the disco group KC & the Sunshine Band are suing bandleader Harry "KC" Casey, Rhino Records and Warner Music Group for breach of contract.

The suit was filed May 5 in California Superior Court in L.A. County (Case No. BC315115) by vocalists Margaret Reynolds and Jeanette Wright-Williams.

According to the complaint, Casey breached a 1977 contract with Reynolds and Wright-Williams by denying them royalties on sales of records by the Sunshine Band.

Rhino currently holds the rights to the group's recording catalog, according to the filing.