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Samsung Backup is easy to use third-party program. It allows Samsung users to transfer various files like music, movies, contacts,messages,photos etc. between your samsung device and the desktop computer within a few clicks. To use the program, you need to connect your phone to the computer and make it recognize by the program.
How to backup Samsung galaxy music [samsung-messages-backup.com]

As you may know, iTunes music are protected by Apple's digital right management (DRM) copyright technology in special format, which allows us to enjoy them on Apple device only, such as iPhone, iPad, iPod touch, etc. It means that we cannot directly sync iTunes music to Samsung Galaxy Note 7 or other android phones, tablets, etc., even after we purchased them. 
But thanks to TunesKit DRM Audio Converter [tuneskit.com] tool, we can now remove such restriction and convert iTunes music to MP3, AAC, FLAC, or other common formats without quality loss, so that we can easily sync them to other portable devices for playback offline. You can get more details from TunesKit [tuneskit.com] Official website.

To sync iTunes music to your Samsung phone, you should make sure that your iTunes songs are playable. Since all music from iTunes comes with DRM protection, you are only allowed to listen to those music tracks within iTunes. So, if you want to transfer them to Samsung phones, you need to remove DRM from iTunes [tunelf.com] and convert iTunes music to MP3 using an iTunes M4P Converter [tunelf.com] first.