Singing harmony with appliances and other inanimate objects? I think it's a symptom of frustration that you don't have anyone to sing ACTUAL harmony with. Well drop the vacuum and step away from the fridge because now you can sing awesome harmony with yourself! Record yourself singing on your computer recording studio. Then sing along with it. Wash, rinse repeat for as many harmonies as you want.
Rembrandt Van Rijn
Willem De Kooning
Robert Indiana
John Kennedy
David Hockney