How do I change music files to mp3 files?

Follow these steps:

Convert a song to a different file format with the Apple Music app or iTunes for Windows - Apple Support

Zonefish,

If you are talking about files that you have downloaded from an Apple Music subscription, they have DRM protection and cannot be converted to MP3.

zonefish Said:

"How do I change music files to mp3 files?"

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Modify a Duplicate on a Computer:

Use Only a Computer: If you are talking about music from iTunes Store, then the only way to try this is to use a computer. You would login to iCloud on it, or iTunes, and download it. Once download it, right-click on the icon, and then select "Duplicate". Once duplicated, modify the duplicate's extension to MP3.