Config is different whether it's Red song or Blue song. For Red, you have several steps.
CODE
SongMagicChargeAnim = {82 => 102, 83 => 107}
Here, you have to put the ID of the loop animation for the song. The number to the left of the arrow is the ID of the skill in the database, and the number to the right the ID of the animation.
CODE
SongMagicMaxBurst = {82 => 700, 83 => 3000, 89 => 6000}
Here, you set the maximum burst value of the song. Again, the number to the left is the skill ID and the one to the right is the max value. Even if your song doesn't evolve anymore, you need to put the max value as it is used for the calculations.
If you haven't set properly these, then you will have an error.