This is an interesting one. Eager to land a record contract with Big Machine Records back in 2005, a then-15-year-old Taylor Swift agreed to give up the rights to her first six albums. This was a decision she came to regret bitterly when her song catalogue was acquired by music mogul and sworn enemy Scooter Braun, who bought the record label in 2019.
Braun sold the masters to investment fund Shamrock Capital in November 2020 for $300 million (£240m) – without Swift's consent. In response to the news, Swift wrote on Twitter at the time that it was "the second time my music had been sold without my knowledge".
While Swift couldn't veto the deal, she still owns the publishing rights as the writer or co-writer of her music and can prevent the use of the songs in certain situations. Shamrock has said it would now like to partner with Swift, though the Bad Blood singer has said that as Braun reportedly retains an interest in the songs, she can't "bring [her]self to be involved in benefiting Scooter Braun's interests".
Swift is famously in the process of re-recording her old albums so that she will own the masters, and she has already pulled off the remarkable feat of delivering near-identical copies of four of the six albums.