To stop playing music on your iPhone, there are a few different methods you can try. The easiest way is to tap the pause button, which is located at the bottom of the screen in the Music app. This button looks like two vertical lines with a small triangle pointing to the right. Simply tap on this button and the music will pause.
Another option is to use the Control Center. To access the Control Center, swipe down from the top right corner of your iPhone’s screen (or swipe up from the bottom on older iPhone models). In the Control Center, you’ll see a section for music controls. Here, you can see the currently playing song and artist, as well as buttons to pause and skip to the next track. Tap the pause button to stop the music.
If you prefer, you can also stop playing music by closing the Music app on your iPhone. To do this, double-click the home button (or swipe up from the bottom of the screen on iPhone X and newer models) to bring up the app switcher. Then, swipe left or right to find the Music app, and swipe it up or off the screen to close it. This will stop the music from playing.
I hope these methods help you stop the music on your iPhone. If you have any further questions, feel free to ask!