Which musical elements were questioned in the modernist movement?

Melody, harmony, and tonality.

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"

Create it and find things around your house to make it .