Songs in playlist not showing up on phone

[scottchips]

So, I got songs from a CD, played them on itunes, found them in the local files of spotify, and put them in to a playlist which I downloaded on to my phone, except for one song which I didn't have time to finish downloading... in other words all went normal in the happening of me getting my songs on my phone. But then it all went wrong.

After I got the songs on my phone, I checked back a few hours later to go play them. They were all gone; the playlist itself was there but it says thereunder "0 tracks" and when I check up therein I see only one song, which is that one that  I hadn't time to download. When I go to this playlist on the computer, it says I have all the tracks there. If I try to make the playlist anew with the same tracks, it only lets me see that one track I never downloaded when I look at it with my phone.

Someone please help, this is ridiculous.