A new battle has erupted between between Apple and Spotify.
Spotify claims that Apple has blocked its latest app update from the Apple app store.
It is all to do with the 30 percent fee that Apple charged companies who sell subscriptions via the app store.
Spotify doesn't think it is fair that Apple collects the fee month after month.
Apple says that Spotify wants special treatment. It says the new app would have tried to circumvent Apple's payment system by sending people straight to Spotify's website, where the 30 percent fee does not apply.
The latest spat comes as talk grows that Apple might buy the rival Tidal music service.