I recently signed up for spotify after using Apple Music for a year. I'm just really excited about trying the ad tier that is free. I downloaded the Spotify Mac application which has an import from iTunes feature but it appears to only import your own music. Is there a way to import the AM songs I've added to my collection? You would think there would be a way to import a playlist of songs regardless of who owns them.
In iTunes click the playlist you want to export then go to File > Library > Export Playlist. Go to https://soundiiz.com and click the convert button. Connect your Spotify account. Click 'Import playlist file' in the pink box and select the exported playlist file then import into Spotify.
I also used MusConv.com tool to import my playlist from Spotify to Google Music. This software allows to import or export playlist from any player to any music player.