Some may find the operatic singing to be more distracting in the classroom. However, some children may not be fazed by it at all. It can be background music or a teaching tool, however you see fit.
This video opens with a quote from Mozart and then focuses on his portrait for the rest of the piece. It is a live recording, so you will hear some applause. The heavy applause hits at the 52:00 mark and continues for quite some time.