Can someone explain to me the harmonic reasoning behind this chord progression?

1. What is the most commonly used harmonic chord progression?
2. Is it illegal to copy chord progressions?
3. How do you analyze a chord progression?
4. Can a chord progression be wrong?

What is the most commonly used harmonic chord progression?

It is obvious that the first chord progression to master is the major II-V-I sequence (A.K.A 2 5 1). It is the most used chord progression found in jazz music. The II-V-I cadence contain three basic chords built from the first (I), second (II) and fifth (V) degree of the major scale.

Is it illegal to copy chord progressions?

Many songwriters are not aware of this, but chord progressions, as such, are not protected by copyright, and can be used by other songwriters. ... The more unique a progression, the harder it is to hide where you got it. This is a completely legal use of another chord progression.

How do you analyze a chord progression?

First Level Chord Progression

1. Determine the key. Find the Key Signature. Find Cadences at end of phrases and sections. Look for ii-V-I's, V-I's, and ii-V's (incomplete cadences that resolve to the I chord at the beginning of the next section) ...
2. Label all chords with Roman Numerals based on their relationship to the I chord.

Can a chord progression be wrong?

Technically, there's no such thing as a “wrong” chord progression in the sense of “prohibited.” But there certainly are chord progressions that are easier for the brain to make sense of.