Any music you had on your previous smartphone will be copied to your new Galaxy S8|S8+* when you transfer your content. If you didn't choose to transfer your music during the Smart Switch process, you can always go back and start the transfer again. To do this:
- Swipe up or down from the home screen to access your app tray
- Select 'Settings'
- Tap 'Cloud and Accounts'
- Select 'Smart Switch'
From here, follow the Smart Switch process and select ''Music'' when asked to do so.
*Movies and music that are DRM (digital rights managed) cannot be transferred via Samsung Smart Switch due to copyright laws.
Source: Samsung