How do I move my music from iTunes to Spotify?
How do I move my music from iTunes to Spotify?
If I move every track from iTunes to Spotify, will all those same songs show up on any other devices where I'm signed in with my account?
You get those playlists stored on your profile page. You can check this out by signing up there and then starting over from a fresh start on another computer.
I have songs stored on my iTunes account, and those tracks came from different places than Apple Music. They aren't even playing on my new Apple Music service. What should I do to get them working there?
Your playlists are stored in your profile, so you can check this by signing into another place, such as a computer, and seeing them there.