Handout 9: Chord Progressions

What You’ll Learn:

What a chord progression is (a sequence of chords that tells a musical story)

How Roman numerals label chords within a key

The diatonic chords in C major (all 7 chords that belong to the key)

Four famous chord progressions that power hundreds of songs

How to play left-hand accompaniment patterns

What Is a Chord Progression?

A chord progression is a sequence of chords played one after another. If a single chord is a snapshot of a mood, a chord progression is a journey through moods — it creates a sense of movement, tension, and resolution.

Think of it like a story: the chords have a beginning (home), a middle (adventure), and an end (coming back home). The specific order of chords is what makes each song feel different, even though many songs share the same progressions.

Almost every pop song, Bollywood hit, classical piece, and folk tune is built on a chord progression. Learn a few key progressions, and you will recognize them everywhere.

Roman Numerals: Labeling Chords in a Key

Musicians use Roman numerals to describe which chord in the key they are talking about. This system is powerful because it works in ANY key — the numerals describe the relationships between chords, not specific notes.

Here is how it works. Take the C major scale:

   C     D     E     F     G     A     B
   I     ii    iii   IV    V     vi    vii°

Each note of the scale becomes the root of a chord. The Roman numeral tells you:

Uppercase (I, IV, V) = major chord
Lowercase (ii, iii, vi) = minor chord
Lowercase with ° (vii°) = diminished chord (a special, tense-sounding chord)

The numeral number tells you which scale degree: I = 1st note, IV = 4th note, V = 5th note, and so on.

Diatonic Chords in C Major

Diatonic means “belonging to the key.” These are all 7 chords you can build using only the notes of C major (white keys only):

Numeral	Chord	Notes	Quality
I	C	C - E - G	Major
ii	Dm	D - F - A	Minor
iii	Em	E - G - B	Minor
IV	F	F - A - C	Major
V	G	G - B - D	Major
vi	Am	A - C - E	Minor
vii°	Bdim	B - D - F	Diminished

Why are some major and some minor? It is because of the intervals in the scale. When you stack thirds using only the notes of C major, some chords naturally come out major and some come out minor. This is not a rule you need to memorize — it is a natural consequence of the major scale’s structure.

For most beginner songs, you will use these four chords most:

I (C) — Home. Feels resolved and stable.
IV (F) — Lift. Feels like floating upward from home.
V (G) — Tension. Feels like it wants to go back to I.
vi (Am) — Emotion. Adds depth and feeling.

Four Famous Progressions

1. I - IV - V - I (The Classic)

   C → F → G → C

This is the most fundamental progression in Western music. It moves away from home (I), builds tension (IV and V), then resolves back home (I). You will hear it in folk songs, hymns, blues, rock and roll, and countless other genres.

On your CT-X9000IN, play these chords with your left hand:

   C (C-E-G) → F (F-A-C) → G (G-B-D) → C (C-E-G)

Hold each chord for 4 beats. Use the metronome at 70 BPM. Listen to how satisfying the return to C feels.

2. I - V - vi - IV (The “4-Chord Song”)

   C → G → Am → F

This progression is so common in pop music that it has been called “the most important chord progression in pop.” A comedian once performed a medley of dozens of hit songs using only these four chords.

Songs that use this progression (or a rotation of it):

“Someone Like You” — Adele
“Let It Be” — The Beatles
“With or Without You” — U2
“Tum Hi Ho” — from Aashiqui 2
“No Woman, No Cry” — Bob Marley
“Kal Ho Naa Ho” — title track
Hundreds more

Play: C (C-E-G) → G (G-B-D) → Am (A-C-E) → F (F-A-C)

The emotional power comes from the shift to the minor chord (Am) — it adds a touch of sadness or longing before resolving to the warm F.

3. I - vi - IV - V (The ”50s Progression”)

   C → Am → F → G

This was the go-to progression in 1950s and 60s rock and roll, doo-wop, and early pop. It has a nostalgic, classic feel.

Songs that use this:

“Stand By Me” — Ben E. King
“Every Breath You Take” — The Police (modified)
Many classic Bollywood songs

Play: C (C-E-G) → Am (A-C-E) → F (F-A-C) → G (G-B-D)

4. The 12-Bar Blues

The 12-bar blues is a 12-measure pattern using only I, IV, and V chords. It is the backbone of blues, early rock, jazz, and many Indian film songs:

   | I    | I    | I    | I    |
   | IV   | IV   | I    | I    |
   | V    | IV   | I    | V    |

In C major:

   | C    | C    | C    | C    |
   | F    | F    | C    | C    |
   | G    | F    | C    | G    |

Each box = 1 measure (4 beats in 4/4 time). The entire pattern is 12 measures = 48 beats. It has a built-in sense of journey: home (bars 1-4), away (bars 5-6), back (bars 7-8), tension (bar 9-10), resolution (bars 11-12).

Transposing: Same Progression, Different Key

The beauty of Roman numerals is that you can play the same progression in ANY key. The numerals stay the same; only the actual chords change.

I - V - vi - IV in different keys:

Key	I	V	vi	IV
C major	C	G	Am	F
G major	G	D	Em	C
F major	F	C	Dm	Bb
D major	D	A	Bm	G

So if a song uses I-V-vi-IV and you want to play it in G instead of C, you just swap the chords to G-D-Em-C. Same emotional journey, different pitch level.

Left-Hand Accompaniment Patterns

Knowing chords is great, but HOW you play them matters too. Here are three common left-hand patterns using C major as an example:

Block Chords

Play all three notes at once and hold.

   Beat:    1    2    3    4
   Play:  [CEG]  -    -    -     (hold for 4 beats)

Simple and solid. Good for slow songs and hymns.

Broken Chords

Play the notes one at a time, bottom to top.

   Beat:    1    2    3    4
   Play:    C    E    G    -     (one note per beat)

Creates a flowing, gentle feeling.

Arpeggio Pattern

Play root, 5th, octave root, then 5th again (or variations).

   Beat:    1    2    3    4
   Play:    C    G    C    G     (alternating root and 5th)
            ↑    ↑    ↑    ↑
           low  mid  high  mid

Creates a rocking, flowing accompaniment. This pattern is used in “Someone Like You” by Adele and countless ballads.

Alberti Bass

A classical pattern: bottom, top, middle, top.

   Beat:    1    +    2    +    3    +    4    +
   Play:    C    G    E    G    C    G    E    G

Named after the 18th-century composer Domenico Alberti. Gives a busy, Classical-era feel. Used extensively in Mozart and other classical pieces.

Exercises

Exercise 1: I-IV-V-I in C

Play C → F → G → C with your left hand, using block chords (all notes at once). Hold each chord for 4 beats at 70 BPM on your CT-X9000IN metronome. Repeat 4 times.

Exercise 2: The 4-Chord Song

Play C → G → Am → F with your left hand, 4 beats per chord at 70 BPM. Once comfortable, try humming any pop song you know over the top. You will be surprised how many songs fit.

Exercise 3: Broken Chord Pattern

Play the I-V-vi-IV progression (C-G-Am-F) but use broken chords: for each chord, play the root on beat 1, the 3rd on beat 2, the 5th on beat 3, hold on beat 4. This creates a flowing accompaniment.

Exercise 4: Transpose to G

Play the I-V-vi-IV progression in G major: G → D → Em → C. The relationship feels the same; the pitch is different. Use block chords with your left hand.

Exercise 5: 12-Bar Blues

Play the 12-bar blues in C. Use block chords, switching chords on beat 1 of each measure. Follow the chart: 4 bars of C, 2 bars of F, 2 bars of C, 1 bar of G, 1 bar of F, 1 bar of C, 1 bar of G. Use your CT-X9000IN rhythm feature set to a blues or swing rhythm to make it groove.

Quick Quiz

What is a chord progression? → Answer: A sequence of chords played one after another that creates a sense of musical movement and tells a musical “story.”
What do Roman numerals represent in music? → Answer: The position of a chord relative to the key. Uppercase = major, lowercase = minor. For example, V in C major = G major (the chord built on the 5th note of C major).
What is the I-V-vi-IV progression in C major? → Answer: C - G - Am - F
Name one song that uses the I-V-vi-IV progression. → Answer: Any of these: “Let It Be,” “Someone Like You,” “Tum Hi Ho,” “With or Without You,” “No Woman, No Cry,” etc.
What is the Alberti bass pattern? → Answer: A left-hand accompaniment pattern that plays the notes of a chord in the order: bottom, top, middle, top (e.g., C-G-E-G for C major).

Key Takeaway

A chord progression is a sequence of chords that creates a musical journey. Roman numerals (I, IV, V, vi) describe chord relationships that work in any key. Four progressions — I-IV-V-I, I-V-vi-IV, I-vi-IV-V, and the 12-bar blues — power the majority of popular songs. Learn these four, and you can play along with hundreds of songs.