Where do audio and visual combine?

Aside from everyday where they quite literally combine for the majority of us to create our perceived existence...

Adverts, concerts, raves, music videos, TV in general, digital media... typically in general (i.e. youtube, iplayer, all VoD), horse racing announcer, clergy in mass/church, visualised sound waves, ripples in liquids etc...

 

 

Answer to my prior question over 'Power'...

National Geographic

 

Now to resolve some of the other thoughts/ramblings...