Amber Neely, AppleInsider:
The whole ordeal takes just a couple of minutes provided you’ve got a computer handy. Be aware that to do this, know that you have to be migrating from a Spotify Premium account —it isn’t possible to copy over from the free tier.
If you are making the move from Spotify Premium to Apple Music and have playlists you’d like to take with you, this seems worth reading. Another path to consider is the iOS app SongShift (free, with in-app-purchase).
I’d love to be able to tap on a Spotify playlist link and have it just play in Apple Music. Never gonna happen, I realize, but that’s the dream.
UPDATE: Another service to try – Tune My Music. Converts pretty much anything. Nice. [H/T @pinkoos]