’90s hip-hop duo Black Sheep have filed a class action lawsuit against Universal Music Group over unpaid royalties in a Spotify deal.

’90s hip-hop group Black Sheep are going after Universal Music Group to the tune of $750 million. According to a Rolling Stone report published on Wednesday, the rap duo filed a hefty class action lawsuit against Universal over unpaid royalties due to an alleged side deal with Spotify. Black Sheep, comprised of members Andres “Dres” Vargas Titus and William “Mista Lawnge” McLean, claim that UMG owes over $750 million to themselves and their entire artist roster for breeching contracts with a “sweetheart” deal with the music streaming platform.

Titus and McLean also claim that UMG accepted cash and company stock from Spotify in exchange for music from their artists, only to “shortchange” artists when distributing royalty payments. In the lawsuit, Titus and McLean said that the “previously undisclosed” deal violates the contract they have with former Universal subsidiary Polygram. Through Polygram, UMG is required to pay 50 percent of all net receipts connected to exploitation of the duo’s music.

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