Music really has a whole lot of depth behind then what it seems. Most people listen to music without really considering how it was formed, or why certain notes are placed in a certain way. I was one of those people, and even worse for me, I played music without understanding it. But in high school, I took an AP Music Theory class, which really helped me see music in a totally different light.
I’ll try to explain how there is some logic behind all types of music, from movie music, electronic music, popular music, virtually all kinds of music.
As some may know, there are 7 notes that are primarily used in music: C,D,E,F,G,A,B. After B is a C, and the process repeats and repeats. When a composer creates a song, he or she usually sets it in a key, which is a group of notes that belong to that specific key. An example of this is the C Major Key, which consists of C,D,E,F,G,A,B, or the F Major Key, which consists of F,G,A,B flat (the note a half step below B), C,D,E.
The I (one) chord, known as the tonic, is created by three notes that start with the first degree of the key, all with 3 half steps in between each note. So for the C major key, the I chord is C,E,G, and for the F major key, the I chord is F,A,C. The tonic chord is usually known as the chord of resolution and grounding.
The V (five chord), known as the dominant, is created by three notes that start with the fifth degree of the key, with each note having three half steps in between. So for C major key, the V chord is G,B,D, and for the F major key, the V chord is D,F,A. The dominant chord is usually know as the chord of tension and drama.
Most composers create music that revolve between the I and V chord, between the resolution and the tension. That’s how the basis of music is formed! I’d love to tell you more about different kind of chords and such, but I’d end up writing an essay or a book by that point.