Senators Marsha Blackburn and Ben Ray Luján urge the regulator to investigate "the impact of Spotify's recent actions."
Here's what all songwriters and music publishers should know about the $230 million loss in U.S. mechanical royalties from Spotify.
The case accuses Spotify of using audiobooks to illegally cut its royalty rates, but the streamer says that argument is "meritless" and "profoundly devalues" literary works.
This is the first time the NMPA has involved the Federal Trade Commission in its battle with a tech company.