Animation

Things have certainly come a log way since Tom and Jerry did their musical best with Liszt's Hungarian Rhapsody..

Then, things were drawn by hand the skill involved with getting picture and music to coincide can only be wondered at.
Nowadays, things are different.  The skill is still there, but now it's with the aid of a vast amount of computer processing power.  I came across a company called Animusic recently on You Tube.  Just look at this...