The answer is :D. Geometry
It was sung by Eddie Cochran.
In tonal Western classical music (music with a tonic key or "home key"), the most frequently encountered chords are triads, so called because they consist of three distinct notes: the root note, and intervals of a third and a fifth above the root note. ... A series of chords is called a chord progression
Seriously you want us to write you an entire essay?! What are you on because if your acting like this I need some of it.
