A CANARY IN THE OFFICE

I need you some advice on how to handle this lady in our office who sings and hums all the time. We have very close opened cubicles and it is driving us crazy. We don`t want to hurt her feelings.

One lady had a friend call and leave her a voice-message asking her to stop humming. Well that didn`t work. She told me she was going to sing no matter what because it was in her to sing.

Help! We don`t want the cat to swallow the carnary but she`s driving us mad!