If you’re interested in music theory, chords are one of the most important concepts to understand. In simple terms, a chord is a group of three or more notes played together to create harmony. Chords are the building blocks of music and form the backbone of many popular songs.

How Are Chords Built?

Chords are built by stacking notes on top of each other in thirds. This means that starting from any note, you skip a note and add the next note in the scale.

For example, if we start with the note C, we can build a chord by adding every other note in the scale: C-E-G. This is known as a C major chord.

There are different types of chords depending on how they are built. The most common types are major and minor chords. Major chords have a happy sound while minor chords have a sad or melancholic sound.

Major Chords:

Major chords are made up of three notes – the root, third, and fifth. For example, a C major chord is made up of the notes C, E, and G.

Minor Chords:

Minor chords also have three notes but with a different interval between them. The intervals in a minor chord are root, flattened third (a half step lower than the third), and fifth. For example, an A minor chord is made up of A, C, and E.

Chord Progressions:

Chord progressions refer to the sequence of chords used in a song or piece of music. There are many common chord progressions used in popular music such as I-IV-V (C-F-G), which is used in many rock and blues songs.

One popular example is the 12-bar blues progression which uses three chords (I-IV-V) played over 12 bars:


This progression is used in many blues and rock songs and can be heard in classics like “Johnny B. Goode” by Chuck Berry and “Hound Dog” by Elvis Presley.


In conclusion, chords are an essential part of music theory. Understanding how they are built and used in chord progressions can help you to create your own music or play popular songs.

By using the correct notes and intervals, you can create major or minor chords with different sounds and moods. So why not grab your instrument and start experimenting with creating your own chord progressions today?