Hi there QueenOS,
Welcome to Apple Support Communities. It appears you need to recover a song deleted within your Apple Music. Depending on how the music was obtained, you can bring this back. If the music was added from Apple Music and not purchased from the iTunes Store, then it would be a matter of finding the song and adding it back to your library.
Take a look at the article below that will talk about adding content from Apple Music:
Add music from the Apple Music catalog to your library on your iPhone, iPad, iPod touch, Mac, or PC
If the music was previously purchased from the iTunes Store, you can always download the track again.
Download your past purchases
All the best.