What are some examples of “highbrow” culture and “lowbrow” culture from the early 1900s? What are some examples today?

It depends on what type of third separates the three notes.for example: if you have two mayor thirds is an "aumented chord"if you have two minor thirds is an "diminued chord"if you have one mayor first and then one minor is a "mayor chord"and inverted is a "minor chord"

The answer is cave paintings