• ⏱ Estimated Time: 25 minutes reading + 20 minutes practice = 45 minutes total
• 📋 Requirements: Completed Lesson 10 — Dynamics
• 🎯 Goal: Understand the number system and use it to transpose any song to any key instantly

The Secret Language of Professional Musicians

Professional musicians communicate using a system called the Nashville Number System. It is how session players, band members and songwriters talk about music without specifying a key. Once you understand it you can transpose any song to any key in seconds, jam with other musicians without confusion, and understand any chord chart you ever encounter.

1. What is the Number System

In Lesson 5 you learned that every key has 7 chords. The number system simply gives each of those chords a number instead of a name.

In the key of G:

• 1 — G major
• 2 — Am
• 3 — Bm
• 4 — C major
• 5 — D major
• 6 — Em
• 7 — F# diminished

Instead of saying play G, D, Em, C a musician using the number system says play 1, 5, 6, 4. The numbers work in any key. The relationships between the chords stay exactly the same regardless of which key you are in.

2. Why This is Powerful

Imagine a singer tells you a song is too high and asks you to play it in a lower key. Without the number system you would need to relearn every chord. With the number system you simply move the 1 chord to a lower key and all the other numbers follow automatically.

The I V vi IV progression in different keys:

• Key of G — G, D, Em, C
• Key of C — C, G, Am, F
• Key of D — D, A, Bm, G
• Key of E — E, B, C#m, A

Same numbers. Different key. Same relationships. Same emotional feel. This is transposition and the number system makes it instant.

3. Major and Minor Numbers

In a major key the chord quality of each number is always the same:

• 1 — major
• 2 — minor
• 3 — minor
• 4 — major
• 5 — major
• 6 — minor
• 7 — diminished

You never need to think about whether a chord is major or minor once you know this pattern. The number tells you everything. A 2 chord is always minor. A 4 chord is always major. No exceptions in a major key.

4. Your Target Songs in Numbers

Clocks — Key of E minor

Main progression: 1m — 5m — b7 — 4. In E minor: Em — Bm — G — D. The driving relentless feel comes from staying in the minor world throughout.

Fix You — Key of Eb major

Verse: 1 — 5 — 6m — 4. In Eb: Eb — Bb — Cm — Ab. On guitar with a capo on fret 1: D — A — Bm — G. Same shape, different sound.

Yellow — Key of B major

Main progression: 1 — 5 — 4 — 1. In B: B — F# — E — B. On guitar with a capo on fret 2: A — E — D — A. Same shape, different sound.

5. The Capo — Transposing Without Learning New Shapes

A capo is a clamp that clips onto the neck and raises the pitch of all strings equally. It allows you to play familiar open chord shapes in any key without learning new fingerings.

Fix You and Yellow both use a capo. This is how Chris Martin plays familiar shapes but in the key that suits his voice. This is also how you will play along with the original recordings in Phase 8.

• Capo on fret 1 — everything goes up one semitone
• Capo on fret 2 — everything goes up two semitones
• Capo on fret 3 — everything goes up three semitones

For Fix You put your capo on fret 1 and play D G Bm A shapes. It will sound exactly like the original recording. For Yellow put your capo on fret 2 and play A E D A shapes.

6. The Circle of Fifths

The circle of fifths is a diagram that shows how all 12 keys relate to each other. Every key is a fifth apart from its neighbours. Keys that sit next to each other on the circle share almost all the same chords which is why they sound so natural together.

You do not need to memorise the circle of fifths today. Just know that it exists and that every time you see it referenced it is simply a map of how keys relate to each other. We return to it in more detail in Lesson 20.

Practice Checklist

Complete every item before moving to Lesson 12.

• ☐ Number system in G — write out all 7 chords in the key of G with their numbers from memory. Target: 3 minutes
• ☐ Number system in C — write out all 7 chords in the key of C with their numbers. C Dm Em F G Am Bdim. Target: 3 minutes
• ☐ I V vi IV in G — G D Em C, Pattern 2, metronome 70 BPM, 10 times. Target: 5 minutes
• ☐ I V vi IV in C — C G Am F, Pattern 2, metronome 70 BPM, 10 times. Target: 5 minutes
• ☐ Capo experiment — put capo on fret 2, play G D Em C shapes, notice how the sound changes. Target: 3 minutes
• ☐ Fix You with capo — capo fret 1, play D G Bm A progression, listen to Fix You and try to match the feel. Target: 8 minutes
• ☐ Yellow with capo — capo fret 2, play A E D A progression, listen to Yellow and try to match the feel. Target: 8 minutes
• ☐ Bonus — transpose a progression — take Em Am G D and move it to the key of A. Am Dm E D. Play both and notice same feel different sound. Target: 5 minutes

What You Learned This Lesson

• ✅ The Nashville Number System and why professional musicians use it
• ✅ How to number any chord in any key
• ✅ The quality of each number — major, minor and diminished
• ✅ How to transpose any progression to any key instantly
• ✅ How to use a capo to play in any key with familiar shapes
• ✅ The chord progressions of Clocks, Fix You and Yellow in number system

Lesson Progress

Posture ████████████ MASTERED ✅

Tab Reading ████████████ MASTERED ✅

First Chords ████████████ MASTERED ✅

Strumming ████████████ MASTERED ✅

Music Theory ████████████ MASTERED ✅

Full Chord Family ████████████ MASTERED ✅

Chord Transitions ████████████ MASTERED ✅

Fingerpicking ████████████ MASTERED ✅

Song Structure ████████████ MASTERED ✅

Dynamics ████████████ MASTERED ✅

Number System ████████████ MASTERED ✅

Barre Chords ░░░░░░░░░░ LOCKED — Lesson 12

🎸 Lesson 11 Complete! XP Earned: +400 — You are now one step closer to playing Clocks by Coldplay.

Next up: Lesson 12 — Barre Chords: The Wall Every Beginner Hits 🎸