Session 13: The 4-Chord Song

Overview

Phase: 3 — Integration
Duration: 1 hour
Prerequisites: Completed Sessions 1-12. Can play 6 chords (C, F, G, Am, Dm, Em). Understands chord inversions and voice leading. Has played “Someone Like You” arpeggio pattern.

Learning Objectives

By the end of this session, you will be able to:

Understand the I-V-vi-IV progression and why it appears in hundreds of pop songs
Play the I-V-vi-IV progression in the key of C (C-G-Am-F)
Play the I-V-vi-IV progression in the key of G (G-D-Em-C)
Play “Tum Hi Ho” with full melody and chord accompaniment
Recognize the I-V-vi-IV pattern in multiple songs by ear

Materials Needed

Casio CT-X9000IN keyboard (Grand Piano tone — Tone 000, metronome ready)
This lesson plan open beside you

Warm-Up (5 minutes)

Scale Review

C major scale — RH at 66 BPM, one time up and down. A minor scale — RH at 55 BPM, one time up and down.

Six-Chord Warm-Up

Play once at 60 BPM. All transitions smooth.

”Someone Like You” Arpeggio Pattern

Play the LH arpeggio pattern for 4 measures (C-G-Am-F) once through. This pattern is the foundation of today’s session.

Theory (10 minutes)

The Most Important Chord Progression in Pop Music

In Session 9, you learned the I-IV-V progression — the backbone of rock, blues, and folk. Today you learn its modern sibling: the I-V-vi-IV progression (spoken: “one-five-six-four”).

In the key of C:

I = C major (C-E-G)
V = G major (G-B-D)
vi = Am (A-C-E) — the lowercase Roman numeral means it is minor
IV = F major (F-A-C)

So the progression is: C - G - Am - F

This four-chord loop is the engine behind an astonishing number of hit songs. Play it and you will recognize the sound instantly:

X:1 T:I-V-vi-IV in C M:4/4 L:1/4 K:C V:1 clef=bass name="LH" "I (C)"[C,E,G,]4 | "V (G)"[G,B,D]4 | "vi (Am)"[A,CE]4 | "IV (F)"[F,A,C]4 |]

Loop it 4 times. Does it sound familiar? It should — you have heard this progression in:

“Let It Be” (The Beatles)
“Someone Like You” (Adele) — you just played this
“Tum Hi Ho” (Arijit Singh) — you will play this today
“No Woman, No Cry” (Bob Marley)
“With or Without You” (U2)
“Kal Ho Naa Ho” (Sonu Nigam)
“Photograph” (Ed Sheeran)
Hundreds more

Why Does This Progression Work?

Each chord has an emotional function:

I (C): Home. Stable. Resolved.
V (G): Tension. Wants to go somewhere.
vi (Am): The emotional turn. The surprise of minor after major.
IV (F): Warmth and openness. Leads beautifully back to I.

The progression creates a cycle of tension and release that feels deeply satisfying. It is the musical equivalent of a heartbeat.

Transposing to the Key of G

The beauty of Roman numerals is that the pattern works in ANY key. In the key of G:

I = G major (G-B-D)
V = D major (D-F#-A) — NEW chord for you
vi = Em (E-G-B) — you already know this
IV = C major (C-E-G) — you already know this

The D major chord:

D (root) — between the 2-black-key group
F# (third) — the black key between F and G
A (fifth) — between the 2nd and 3rd keys of the 3-black-key group

RH D Major Chord:

X:1 T:RH D Major Chord M:4/4 L:1/4 K:D [DFA]4 |]

Finger 1 on D, finger 3 on the F# black key, finger 5 on A.

LH D Major Chord:

X:1 T:LH D Major Chord M:4/4 L:1/4 K:D V:1 clef=bass name="LH" [D,F,A,]4 |]

Finger 5 on D, finger 3 on F#, finger 1 on A.

Play each hand 5 times. This is your first chord with a black key. Notice that finger 3 sits on the black key — this is comfortable because the black key is higher, and your longer middle finger reaches it naturally.

Technique (15 minutes)

I-V-vi-IV in Key of C

Play the full progression with LH block chords:

X:1 T:I-V-vi-IV in C (Block Chords) M:4/4 L:1/4 K:C V:1 clef=bass name="LH" "C"[C,E,G,]4 | "G"[G,B,D]4 | "Am"[A,CE]4 | "F"[F,A,C]4 |]

Repeat 4 times at 66 BPM.

Now try with voice-led inversions for smoother transitions:

X:1 T:I-V-vi-IV Voice-Led M:4/4 L:1/4 K:C V:1 clef=bass name="LH" "C root"[C,E,G,]4 | "G 2nd inv"[G,B,D]4 | "Am 1st inv"[C,E,A,]4 | "F 2nd inv"[C,F,A,]4 |]

Repeat 4 times. Notice how much less your hand moves with voice leading — especially the last two chords where only one finger changes.

I-V-vi-IV in Key of G

Now play the same pattern in G:

X:1 T:I-V-vi-IV in G M:4/4 L:1/4 K:G V:1 clef=bass name="LH" "G"[G,B,D]4 | "D"[D,F,A,]4 | "Em"[E,G,B,]4 | "C"[C,E,G,]4 |]

Repeat 4 times at 60 BPM (slower — the D chord is new).

Tips for the D chord transition:

From G to D: finger 5 drops from G to D, finger 3 drops from B to F# (black key), finger 1 drops from D to A. Each finger moves down.
From D to Em: finger 5 moves from D up to E, finger 3 from F# up to G, finger 1 from A up to B. Each finger moves up one step.

Pop Accompaniment Pattern

Instead of playing chords as block whole notes, try this rhythmic pattern that sounds more like an actual pop song:

LH rhythmic pattern per measure (4/4 time):

Beat 1: root note alone (finger 5) — quarter note

Beat 2: full chord (fingers 5+3+1) — quarter note

Beat 3: rest — quarter rest

Beat 4: full chord (fingers 5+3+1) — quarter note

In the key of C:

X:1 T:Pop Accompaniment Pattern in C M:4/4 L:1/4 K:C V:1 clef=bass name="LH" "C"C, [C,E,G,] z [C,E,G,] | "G"G, [G,B,D] z [G,B,D] | "Am"A, [A,CE] z [A,CE] | "F"F, [F,A,C] z [F,A,C] |]

This “bass-chord-rest-chord” pattern is the bread and butter of pop piano accompaniment. Practice it 4 times through the C-G-Am-F progression at 66 BPM.

Repertoire (20 minutes)

“Tum Hi Ho” (Arijit Singh) — Full Arrangement

“Tum Hi Ho” from the film Aashiqui 2 (2013) is one of the most beloved Hindi film songs of the last decade. It uses the I-V-vi-IV progression in the key of A minor/C major — exactly what you have been practicing.

Tempo: 68 BPM (slow, deeply emotional) Time Signature: 4/4 Key: C major / A minor (the song moves between relative major and minor)

Right Hand (Melody):

Place RH with finger 1 on Middle C. You will need to reach up to A and B above G:

Note about A: The note A sits one key above G. Stretch your pinky (finger 5) from G up to A, or briefly shift your hand position. After playing A, return to C position.

Simplified LH alternative (block chords):

Each measure: chord as whole note (hold 4 beats)

Am — F — C — G — (repeat for all 16 measures)

Learning approach:

Step 1: RH melody alone (5 minutes)

Measures 1-4: The opening verse melody. E, D, E — C… E, D, E — G. The melody gently rises. This is the “Hum tere bin ab reh nahi sakte” section. Repeat 5 times.
Measures 5-8: The melody reaches up to A and then descends. More emotional. Repeat 5 times.
Measures 9-12: The chorus — “Tum Hi Ho.” More rhythmic, with repeated notes. Repeat 5 times.
Measures 13-16: The chorus continues and resolves to C. Repeat 5 times.
Full melody: All 16 measures.

Step 2: LH accompaniment alone (5 minutes) Play the arpeggio pattern (or block chords) through all 16 measures. The progression repeats: Am-F-C-G throughout. Practice until the chord changes feel automatic.

Step 3: Both hands — 4 measures at a time (5 minutes)

Measures 1-4, both hands, 3 times.
Measures 5-8, both hands, 3 times.
Measures 9-12, both hands, 3 times.
Measures 13-16, both hands, 3 times.
Full 16 measures.

Dynamics:

Verse (Measures 1-8): Soft and intimate (mp). This is a confession of love.
Chorus (Measures 9-16): Build to mezzo-forte. The chorus is the emotional release — “Tum Hi Ho, tum hi ho” — let it sing.
Measure 16 (final C): Let it ring with gentle conviction. You are home.

Pop Medley: Same Progression, Different Songs

After you have “Tum Hi Ho” under your fingers, try this: keep the LH playing the same C-G-Am-F pattern (or Am-F-C-G — they are the same progression starting on different chords), and play these melody snippets on top:

“Let It Be” snippet (Measures 1-4 from Session 10):

“No Woman, No Cry” snippet:

The point of this medley is not to learn new songs in detail — it is to prove that the SAME four chords support completely different melodies. This is one of the most powerful insights in popular music.

Review & Homework (10 minutes)

Summary

Today you learned the most important progression in pop music:

The I-V-vi-IV progression: C-G-Am-F (in key of C) and G-D-Em-C (in key of G)
How to transpose a progression from one key to another using Roman numerals
The D major chord (D-F#-A) — your first chord with a black key
“Tum Hi Ho” — a full Bollywood arrangement with melody and arpeggio accompaniment
That the same 4 chords underpin hundreds of hit songs

Ear Training Exercise: Spot the Progression

Play the I-V-vi-IV in C (C-G-Am-F) as block chords, 4 times through. Let the sound sink into your memory.
Now listen to any of your favourite pop songs (on your phone, in your head, or hummed by a friend).
Can you hear the moment when the progression appears? Does the chord pattern match what you just played?
Try humming “Tum Hi Ho” while playing the C-G-Am-F pattern. Does it fit? (Yes — the song uses vi-IV-I-V, which is the same progression starting from Am.)

Self-Check Questions

What chords make up the I-V-vi-IV progression in the key of C? (Answer: C, G, Am, F)
What chords make up the I-V-vi-IV in the key of G? (Answer: G, D, Em, C)
What three notes are in the D major chord? (Answer: D, F#, A)

Practice Homework (Before Next Session)

I-V-vi-IV in C — LH block chords, 4 times through at 66 BPM. Then try the pop pattern (bass-chord-rest-chord). (3 minutes daily)
I-V-vi-IV in G — LH block chords, 4 times through at 60 BPM. (2 minutes daily)
“Tum Hi Ho” — RH melody 3 times, then both hands 3 times at 68 BPM. (6 minutes daily)
A minor scale — RH and LH, 2 times each at 55 BPM. (2 minutes daily)
Pop medley exploration — Play the C-G-Am-F chord pattern and try singing or humming any song you know over it. See which songs fit. (2 minutes daily — this should be fun, not a drill)

Total daily practice: approximately 15 minutes.

Common Mistakes to Watch For

D chord: F instead of F#: The D major chord uses F-SHARP (the black key), not F (the white key). If the D chord sounds wrong or muddy, check that finger 3 is on the black key between F and G.
Progression order confusion: I-V-vi-IV = C-G-Am-F. The vi (Am) comes AFTER the V (G), not before. If you play C-Am-G-F, that is a different progression. Both sound good, but they are not the same.
“Tum Hi Ho” arpeggio too mechanical: The arpeggios should flow like waves, not march like soldiers. Keep a gentle, even touch. Imagine each arpeggio pattern as a single sweeping gesture.
Transposition confusion: In the key of G, the I chord is G (not C). Everything shifts. If you are confused, write out the G major scale (G-A-B-C-D-E-F#) and build chords on scale degrees I, V, vi, and IV.

CT-X9000IN Tips

Indian Tones for “Tum Hi Ho”

“Tum Hi Ho” sounds beautiful on Grand Piano, but try these tones for variety:

Tone 193 (Santoor) for the RH melody — this gives the song an Indian classical quality
Tone 049 (Strings) for a lush, cinematic sound

If you use the MIDI recorder, record the LH arpeggio on Grand Piano, then play the RH melody with an Indian tone on top. This creates a fusion arrangement that sounds remarkably polished.

Indian Rhythm for Practice

Try an Indian rhythm like Rhythm 213 or a similar Filmi rhythm at 68 BPM while playing “Tum Hi Ho.” The tabla and dholak backing adds an authentic Bollywood feel to your playing. This is the kind of feature that makes your CT-X9000IN special for Indian music — most keyboards do not have these rhythm options.

Understanding the Connection

Notice that “Tum Hi Ho” uses Am-F-C-G and “Let It Be” uses C-G-F-C — they share many of the same chords. Pop music across the world uses the same harmonic language. The melodies and cultural flavours are different, but the chord foundations are remarkably similar. This is why learning chord progressions is so powerful — one pattern unlocks music from every culture and era.