Companion to the one filed against Sony BMG.

Indie label TSR Records is expected to file a lawsuit today (March 28) against Warner Music Group over payola allegations, according to a source. The action is a companion suit to the one filed by TSR against Sony BMG last October, three months after the major label settled a payola investigation with New York State attorney general Eliot Spitzer. WMG settled a similar investigation last December.

The suit, claiming antitrust violations and interference with the indie label's potential business profits, follows two similar complaints filed last week in the U.S. District Court in Los Angeles by the same lawyers -- Maxwell Blecher and Neville Johnson -- for New Jersey-based Radikal Records.

All of the suits claim that the major labels keep indie-label artists off radio airwaves to exclusively promote their own artists; they secure radio airtime by using in-house and independent promoters who "systematically bribe radio stations" to "ensure playtime for their records to the exclusion of independent labels."

WMG and Sony BMG could not be immediately reached for comment.