How to get old music back
How do I get my old music back on my iPhone X r
Apple Watch Series 2, watchOS 5
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Without any further information, I assume this is music you previously purchased from the iTunes Store. If so, see the "How to redownload music on an iPhone, iPad, or iPod touch" section in:
Redownload apps, music, movies, TV shows, and books - Apple Support
If not, can you be little more specific?