Why are the audio tracks on my phone shown with square characters when I transfer them with Nokia Music Manager from my PC?

Check that the track names do not contain any special characters, for example Scandinavian or Cyrillic characters. This problem can appear in two situations: 1) You are using a phone that doesn't support all the characters you have used in track names, or 2) you have converted your music tracks to eAAC+ (.M4A) format. The eAAC+ format contains only the ID3V1.0 tag for track names and this supports only 7bit standard ASCII characters from a to z.