Move entire folder if it contains mp3

New to hazel, have a feeling it is going to save me extreme amounts of time.
I am in the process of setting up rules and a question popped up.
Say I have a folder that contains mp3s and a few other files. How can I set up a rule that detects an mp3 within the folder and thus moves the entire containing folder to a new folder called mp3?
I am in the process of setting up rules and a question popped up.
Say I have a folder that contains mp3s and a few other files. How can I set up a rule that detects an mp3 within the folder and thus moves the entire containing folder to a new folder called mp3?