Hello,
I have a friend that purchased a karaoke backing track through Apple Music, to his phone. How do I go about importing it into Sonar? He wants to add Vocals. I'm betting this situation has come up for others out there who are a lot smarter than me. Thanks for any suggestion on how to accomplish this!😄

There are several ways of getting the file off of the iPhone. Here are some of the options:
 
https://support.apple.com/en-us/HT201301
 
Once you have it on your Sonar PC, you should be able to import it like any audio file as long as it's in a supported format with no DRM.
 
https://www.cakewalk.com/Documentation?product=SONAR&language=3&help=Recording.32.html

If the downloaded track does have DRM, then use itunes to burn it to an audio CD then import the track from the CD. Though doing this might breach the license and copyright law, especially if released for public access paid or unpaid, unless you obtain sample clearance for using the track.

Thanks Telecharge, for the helpful links!😀

The hardest task I've ever done is to transfer data to Android or computer ,
But for transfer to Sonar from iPhone , maybe it can help us ,