Thanks for the question. Now let’s we see how to delete music from iPhone easily. To delect perfectly, Please follow all the steps very carefully.

Step 1. Go to Head over to the Settings (It will be a grey coloured app with a gear icon. You will found this app on the Home Screen of your iPhone.)

Step 2. Click General (You will get option towards the bottom of the display.)

Step 3. Click Storage and iCloud Usage (You will find this to bottom of the screen)

Step 4. Beneath the Storage section, click Manage Storage (You will find this option at the top of the page.)

Step 5. Click Music (This is a white app with a multicolour musical note in the front.
Location of your app will vary as apps are being organised by the amount of space they take.)

Step 6. Make your mind about what you want to delete
Maybe you want to remove each song on iPhone, or perhaps you want to delete an artist. You can also be a little more specific:
Click on a particular artist’s name to view the page of their Album.
You can also go and view the songs.

Step 7. Click Edit (Within the Music section, you will see this in the top right corner of the screen.)

Step 8. Click the red circle (Ensure that you are performing it next to album, song or artist that you don’t want to see.)

Step 9. Click Delete (You will see this delete option on the right of the chosen option. It will right away remove song,
album and artist both from the Music app and from the phone.)

Step 10. Enter Done when you are done (You will find this option in the top right corner of the screen. The items you chose are now disappeared from iPhone.)

Get more info here…
https://www.resetcode.org/2019/01/how-to-delete-music-from-iphones-hard.html

How to Delete the songs from Music App

Thanks

Go to Settings > General > iPhone Storage or iPad Storage. Scroll to Music and tap it. Swipe left on All Songs or on the item that you want to delete, then tap Delete.

Hope this helps