I have 3 old Apple ID's that I used to purchase music. After upgrading to a new phone there are many songs I can't play because they are from the old ID's. Apple doesn't recognize them any more. How can I retrieve my music and authorize my latest phone to download the songs?
When you say they "don't work" where exactly is this happening? Have you tried logging in directly via the apple website? Eg, (I forget the precise url, but) if you try http://cloud.me are you able to login with your old credentials there?
Have you tried via alternative mediums: iTunes directly (ie not via the phone)
And are you sure it's not an authorisation issue in that you have too many authorised computers/devices
Finally what happens if you try "forgotten password" on the website, does it say the old accounts are invalid?