The entirety of the video is shot from the listener's perspective and therefore, through the use of the binaural recording technique, you will be able to hear the position of the musicians 'move' around you as the viewpoint of the camera changes. None of the singers or instruments are using additional mics.

Neumann KU100 Dummy head binaural microphones

Binaural recording is the process of capturing audio using two microphones that are shaped like human ears. Binaural microphones capture audio the same way your real ears hear sounds.  The ears (pinnae) dramatically alter the incoming sound waves, but our brains understand these alterations as directional cues.  In addition, the time delay between the ears gives us proper left/right directional cues.  When you listen to binaural recordings using headphones, the result is a natural three-dimensional sound that gives the listener the sensation of being in the space where the audio was recorded. Essential for all VR work - Oculus, or Vive