Sync s7 with Windows Media Player

[AC Question]

I hook my new s7 up to the computer and drag playlists to sync in Windows Media Player. It only copies some of the songs and most of the playlists either don't show at all (in Google Play Music) or they show up but only have 1 or 2 songs in them. My music library is kept on my laptop and I've always relied on Media Player to organize. I don't mind installing other players, but I really need the playlists to work! Help... ?