text: ALTER TABLE audio_song
  MODIFY COLUMN audio_file1 longtext;
  ALTER TABLE audio_song
  MODIFY COLUMN audio_file2 longtext;
  ALTER TABLE audio_song
  MODIFY COLUMN audio_file3 longtext;
  ALTER TABLE audio_song
  MODIFY COLUMN audio_file4 longtext;
  ALTER TABLE audio_song
  MODIFY COLUMN audio_file5 longtext;
  ALTER TABLE audio_song
  MODIFY COLUMN audio_file6 longtext;
  ALTER TABLE audio_song
  MODIFY COLUMN video_file1 longtext;
  ALTER TABLE audio_song
  MODIFY COLUMN video_file2 longtext;
  ALTER TABLE audio_song
  MODIFY COLUMN video_file3 longtext;
  