This overhead drone at my son's high school graduation ceremony in Prescott AZ the other day was completely enexpected by everyone I've talked to. It was present the whole time (I presume to record the event), but I didn't capture it on video until the ceremony ended. The music ("Fly Like an Eagle") was being broadcast by the school for the enjoyment of graduates and guests and is entirely coincidental.
In the end, it was harmless, but it was distracting sometimes. Personally, I felt offended by having no advance warning about it. What do you think?