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Here are the steps on how to delete music from your iPhone.
Before you delete, find out if you'll be able to download the song you deleted again (it depends on where you live). To delete a song:
- Tap the Music app.
- Tap the Songs category.
- Swipe left to right over the song you want to delete.
- Tap Delete.
If you wish to remove all music from your device, navigate to Settings > General > Usage > Music > Edit then the delete icon.