AltStore is currently the gold standard for sideloading IPAs without paying for a developer certificate. It uses your own Apple ID to "sign" the app for 7 days (free accounts) or 1 year (paid developer accounts).
$5.99/month includes full access with verified student ID. apple music ipa install
Installing an Apple Music IPA (iOS App Store Package) allows users to sideload specific versions of the music app or use it on unsupported devices, such as Apple Silicon Macs AltStore is currently the gold standard for sideloading