can i download my music to a new I phone xr

It depends on what music you’re trying to sync - if you have your own, you need to get it into iTunes (if working on PC or a Mac running Mojave or older) or the new app on Catalina on Mac (which I haven’t tried yet).

If you have music you’ve purchased on the Apple store, you should be able to download it to your phone in the app.

Sync music through iTunes on your computer.