How to Cancel Apple Music
Quick answer
On iPhone, open Settings, tap your name, then Subscriptions > Apple Music > Cancel Subscription (Apple's steps). You keep Apple Music until the end of the period you've paid for.
Before you cancel
When Apple Music ends, songs you added from the Apple Music catalog stop playing, and downloads go with them. If you want your playlists on another service, move them while your subscription is still active.
Pick where your music is going.
Cancel on each device
Settings > your name > Subscriptions > Apple Music > Cancel Subscription.
Open the App Store, click your name at the bottom of the sidebar, then click your name again. Click Subscriptions, click Apple Music, then Cancel Subscription (Apple).
Open the Apple Music app, tap the menu button, then Account, Manage Subscription and Cancel Subscription. If you pay through Google Play, cancel in the Google Play app instead.
Sign in at music.apple.com, click the My Account icon, then Settings. Scroll to Subscriptions, choose Manage, then Cancel Subscription (Apple).
Apple One
If you get Apple Music through Apple One, you can't cancel Apple Music on its own. Cancel Apple One or switch to a plan without it from the same Subscriptions screen.
FAQ
Playlists made of Apple Music catalog songs stop playing. Songs you bought or synced from your computer still play. Move catalog playlists to your new service before the subscription ends.
Apple handles refund requests at reportaproblem.apple.com. They aren't guaranteed.
Cancel at least a day before the trial ends so you aren't charged.