Hello she130,
Thanks for reaching out to the Apple Support Communities! I understand that you've noticed a rapid decrease in your battery life when listening to Apple Music. This is occurring most often when you use the lyrics option while listening to music.
Nice work thinking to check the battery usage first. Next, check to see what the iPhone is reporting for the health of the battery. Go to Settings > Battery > Battery Health You'll want to look at the Maximum Capacity and see if it is reporting Peak Performance Capability. This article will give you more details: iPhone Battery and Performance.
If you see a message about the battery health, see if it matches any of the ones which are listed in the article.
If there is no message, begin by quitting the Music app with these steps: How to force an app to close on your iPhone, iPad, or iPod touch.
Once it is closed, Restart your iPhone, and see if there is any change.
All the best!