You might download a file labeled "Instrumental," only to find that it’s actually a karaoke track with a faint backing vocal or a terrible MIDI (synthesized) version that sounds like a 90s video game.

Since iPhones use the .m4r format, you will need to convert the MP3 or use GarageBand:

You can search for the instrumental version on various music platforms or YouTube using the following terms:

Download the version to your computer or via the Files app. Connect your iPhone to iTunes or Finder.