Last month beta testers found that Apple had added a feature to iOS 14.5 allowing users to change the default music app, Apple Music, to any other third-party app they had installed. However, this does not appear to be the case.
On Friday, Apple cleared up some confusion regarding reports that iPhone users would be able to change their default music app in iOS 14.5. It says users cannot change the default player because there is no settings entry for that like there is for email and browser apps.