If viewed within the bewildering context of the history of western music, the triad is one of the absolute bedrocks of all the harmony that we hear, and despite its roots back to classical music, it's a mainstay for all forms of commercial music.
As the name suggests, a triad is a chord which is made up of three notes. Knowing which three notes to employ is not a rocket science, but it does require a very small degree of musical knowledge, coupled with exceptionally simple numeracy.
We have to revisit our basic musical scale, and for the moment we'll stick with C major.
