Even if you find a working IPA, Apple forces free developer accounts to re-sign the app every 7 days. If you don't connect to your PC and AltStore to refresh it, the app dies mid-playback. To avoid this, you need a "TrollStore" or a paid developer account ($99/year). At that point, just pay for Apple Music ($10.99/month).
A tweaked IPA that reverts the UI to a legacy design, removing the "Listen Now" tab and restoring the old "For You" heart system. The Reality: Partially possible but fragile. UI changes can be made via runtime manipulation (using tools like FLEX or Cydia Substrate). However, Apple Music is a live service. When Apple updates its backend API endpoints (which happens weekly), the old UI code fails, causing the app to crash or display blank spaces. apple music ipa exclusive