I like showing this to my students for a number of reasons. If you're someone who has an honors chorus you could show this one to talk about the importance of the accompanist and talk about how you have to work together in an ensemble to really make something wonderful. This is my main purpose for showing it: displaying the connection between parts and showing how accompanist and soloist have to work together. You could use it to talk about opera or an opera singer's voice (though there really are so many other wonderful videos about that) or about the accompanist's job. Or you can just use it as a really funny video to show off a diva in her natural habitat (in front of the camera). However you use it, it's a fun video with lots of connections and possibilities. Just think of the vocabulary! Opera, accompanist, soloist, piano, accompanied vs. unaccompanied, and more and more and more!
Just to get you interested, here is one of my favorites!
Film Friday -- Teaching Piano and Forte!