thats how you use a musical number in a show it has to help progress the story the song itself needs to have a point or story
like when the song number with the croc or alligator , prince and the main character...kinda forgot their names sorry >_<
what does the song tell? What they desire after they become human
Will the story work without the song? Probably will but the song number helps fortify the story concept further
Does the studio have funds to add the song number if the necessary? yes
Does it have to be a song number? No but it will it more interesting
or the song number when they first meet firefly character...Ray was his name i think
what does the song tell? They were going the wrong way and Ray needed to show them the right direction
Will the story work without the song? No because without the song number the audience will wonder...how did they find their way to Mama Odie if the aligator/croc dude was leading them the wrong way
Does the studio have funds to add the song number if the necessary? Yes
Does it have to be a song number? No but it will it more interesting
now if you can answer at least the first 3 questions...go on talk to the director, voice talent, sound/design crew, senior storyboard artists...pretty much the head honchos and try make the song work and interesting to the GENERAL audience...its really best not to target a very very specific audience it will backfire one way or another
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XD one of the major reasons why i loved this movie aside the animation, unique story etc...is because of the song/musical numbers 
