How can I flush/clear database for single app, i.e. NOT the Project?

I have a multi-app project. 
In a particular app I created my model with single class. 
I populated the db for that model with the Admin Interface.
Now i have changed the model to have 2 classes related by a ForeignKey.
I ran makemigrations on that app and it said, "you are trying to add a 
non-nullable field 'song' to part without a default; we can't do that (the 
database needs something to populate existing rows)."
I don't want to keep the existing populated tables for that app.
How can i start over for that app?
I can see this happening again and again for me.

Thanks in advance.
Love and peace,
Joe

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