1. Open the Music App on the iPhone.
2. Find the music song, album or playlist you want to download.
3. In the song or library, select the item you want to download.
4. Click the "More" option next to the item, and then select "Download" or click "Download" directly at the top of the album or playlist.
5. In this way, the music you selected will be downloaded and saved in the local storage of iPhone, so that you can listen to it offline.
6. Apple Music is a popular music streaming service, which allows users to listen to and download high-quality music anytime and anywhere.