A year after dropping their HBO documentary, The Defiant Ones, Dr. Dre and Jimmy Iovine have to testify in a case brought against them by a former business partner. Steven Lamar is suing Dre and Iovine and Beats Electronics for allegedly not paying him more than $100 million in royalties.

Iovine met Dre when he was trying to release his debut solo album, The Chronic, after he was out of a record deal.

The Interscope Records founder began meeting with technology companies to figure out digital distribution deals, and in 2003, Iovine helped get licenses from other labels to sell music online through iTunes.

It’s reported that back in 2007, that Dre and Iovine agreed to pay royalties of “4 percent base price of every headphone.” Even with this, Lamar feels he is owed a huge chunk of unpaid royalties.