Lighting and motion/placement of camera

 

This is just a random video that I was watching on youtube.  I found it interesting how the editor did not make any cuts throughout the entire video.  It made it very interesting to me. I also notice that whenever the camera was on a profile shot of the singers, that one was in the light and the other was in darkness.  It went well with the lyrics to the song, especially the line "Say something I'm giving up on you".  Both of them want the other to speak up and come out of the darkness.