It is one of the oldest and hardest lessons of the music industry: No matter how successful artists may be, chances are someone else owns their work.

Prince, protesting how his label, Warner Bros., had control over his master recordings, quipped in 1996: “If you don’t own your masters, your master owns you.” That same year, when Janet Jackson negotiated a landmark contract with Virgin Records, ownership of her original recordings was a major deal point.

Now we can add Taylor Swift to the chorus of artists who have bemoaned that their creative work is someone else’s property, as she once again used her social-media megaphone to stir debate about the inner workings of the music industry.

[Read our review of Taylor Swift’s new album, “Lover.”]

In a Tumblr post on Sunday, Swift responded bitterly to the news that her former label, Big Machine, had been sold for more than $300 million to a company run by Scooter Braun, the manager of pop stars including Justin Bieber and Ariana Grande.