What is the major source of information about the North American Indians prior to 1500

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"

They used it to make different appt

Ibelieve it is jitter