I've been occupied recently with all the great animation of Norman McLaren who created a large body of work from the mid 30's up thru the 80's.. Great stuff.
Here is a film short showing McLaren creating his own soundtrack. He created it himself by drawing and scratching into the edge of the film where the optical soundtrack is found.. Wow! Amazing! It is very Raymond Scott sounding.... and actually a lot like some of the other soundtracks for McLaren's films by composer Maurice Blackburn who also employed that way of music making.