Urban beekeeping in New Mexico's largest city.
If you listen carefully, you can hear the queen making piping sounds before she emerges from her cell.
Here is another good video of a virgin queen making several piping sounds
Piping is most common when there is more than one queen in a hive. It is postulated that the piping is a form of battle cry announcing to competing queens and the workers their willingness to fight. It may also be a signal to the worker bees which queen is the most worthwhile to support. - Wikipedia