You can use a third-party repository like AppPure or iMazing to download the Apple Music IPA:
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Note: The App Store is the official way to get Apple Music. Installing IPA files from third‑party sites can violate terms of service, risk malware, and break app updates. Below is a general, security‑focused walkthrough for obtaining and sideloading an IPA you already legally own (for example, a backup of an app you developed), plus safer alternatives. You can use a third-party repository like AppPure