Olivia Dean is seven months out from her Grammy win for best new artist and holding the longest-running UK No 1 in history with Sam Fender, when Mattie Music Group filed a copyright infringement lawsuit in US federal court in Los Angeles on Thursday. The target: I've Seen It, the closing track on Dean's 2025 album The Art of Loving, which Mattie alleges copied 'substantial' aspects of Bill Withers and Grover Washington Jr's 1981 classic Just the Two of Us. The suit's architecture is revealing. Dean, co-writers Bastian Langbaek and Max Wolfgang are not named as defendants — Sony Music Publishing, Capitol Records (Dean's label), and Kobalt Music Publishing America (Wolfgang's publisher) are. That's a standard enforcement play: go after the deepest pockets and the entities with ongoing commercial exploitation of the track. The lawsuit alleges all three had 'a reasonable opportunity to encounter' Withers' work before creating the song. Mattie's case leans on musicologist Alexander Stewart, who concluded the works share 'substantial similarities in protectable musical expression.' The specific language in the complaint — 'the number, character, and arrangement of the shared musical features are so striking that they support an inference that the similarities did not result from coincidence, independent creation or reliance on common musical elements' — is essentially the Ninth Circuit's 'extrinsic test' language, the legal standard for music copyright in federal court. Mattie is framing this as open-and-shut. The cultural context matters. Just the Two of Us had a significant TikTok-era revival before I've Seen It was written — the complaint explicitly references this resurgence, establishing that the song was not merely historically available but actively circulating in the same digital ecosystem Dean operates in. That's legally useful and practically intuitive: the song was everywhere. Mattie says it put the defendants on written notice on 17 August, identifying the similarities. The defendants, per the complaint, continued commercially exploiting the track anyway. That decision — to keep the song in circulation after formal notice — is either a legal calculation that the claim won't hold, or a negotiating posture, or both. Either way, it's what converted a potential licensing negotiation into a lawsuit seeking damages and a permanent injunction. The stakes here are structural, not just financial. I've Seen It is the closing track on an album that just won the Brit award for album of the year. A successful injunction wouldn't just stop streaming royalties — it would remove a key work from Dean's catalogue at the peak of her career. For Withers' estate, administered by his widow Marcia Johnson through Mattie (named after Withers' late mother), this is about enforcing the legacy of a three-time Grammy winner who died in March 2020. Representatives for Dean, Capitol Records, and Kobalt had not responded to the Guardian by Friday. Kobalt declined to comment to Billboard. The industry will be watching closely: Dean is the UK's biggest emerging artist of 2025, and a victory for Mattie would send a signal about the enforceability of melody rights in an era when sonic reference and homage are endemic to commercial soul and R&B production.