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Yeah I'd literally pay $20 to have the iOS 7 or 6 music app.

You are aware that there are several alternative music app replacements that focus on local libraries? Cs Music Player is probably the most popular one of them: https://apps.apple.com/us/app/cs-music-player/id924491991

Yes, was a Cesium user for years, but 3rd party apps don't let you search the Apple music store unfortunately.