---
watermark: ORIRO
disable-model-invocation: true
name: creative-music-theory
provider: ORIRO.ai
copyright: Copyright (c) 2026 ORIRO.ai
description: >




  Music theory — notes, scales, chords, rhythm, harmony, melody, and composition basics.


  Sources: Open educational resources, Canva Design School, MIT OCW Architecture, design classics.
---

# Music Theory

## The foundation: notes and the octave

Twelve notes in Western music: C, C#/Db, D, D#/Eb, E, F, F#/Gb, G, G#/Ab, A, A#/Bb, B.
Then back to C (one octave higher = double the frequency).
On piano: White keys = natural notes. Black keys = sharps/flats.

**Half step (semitone):** Smallest interval. One key to the adjacent key.
**Whole step (tone):** Two half steps.

## Scales

### Major scale

Pattern of whole and half steps: W-W-H-W-W-W-H.
C major: C-D-E-F-G-A-B-C (all white keys on piano).
Sounds happy, resolved, bright.

### Minor scale (natural minor)

Pattern: W-H-W-W-H-W-W.
A minor: A-B-C-D-E-F-G-A.
Sounds sad, dark, serious.
A minor is the "relative minor" of C major — they share all the same notes.

### Pentatonic scale

5 notes. Most useful scale for improvising.
Major pentatonic: 1-2-3-5-6 of major scale.
Minor pentatonic: 1-b3-4-5-b7 of minor scale.
Most folk, blues, rock solos = minor pentatonic.

## Chords

### Triads (3-note chords)

Built by stacking thirds (every other note of the scale).
**Major triad:** Root + major 3rd + perfect 5th. E.g., C major: C-E-G. Bright, happy.
**Minor triad:** Root + minor 3rd + perfect 5th. E.g., C minor: C-Eb-G. Dark, sad.
**Diminished:** Root + minor 3rd + diminished 5th. Tense, unstable.
**Augmented:** Root + major 3rd + augmented 5th. Dreamy, unresolved.

### Seventh chords (add one more third)

**Major 7 (Cmaj7):** C-E-G-B. Dreamy, sophisticated.
**Dominant 7 (C7):** C-E-G-Bb. Bluesy tension, wants to resolve.
**Minor 7 (Cm7):** C-Eb-G-Bb. Mellow, melancholy.

### Chords in a key (diatonic chords)

In C major, the chords built on each scale degree:
I (C major), ii (D minor), iii (E minor), IV (F major), V (G major), vi (A minor), vii° (B diminished)
Major key formula: Major-minor-minor-Major-Major-minor-diminished

## Chord progressions

**I-IV-V:** Foundation of blues, rock, folk. C-F-G in C major.
**I-V-vi-IV:** Pop music workhorse. C-G-Am-F. Hundreds of hit songs.
**ii-V-I:** Jazz standard. Dm-G-C in C major. Strong resolution.
**I-vi-IV-V:** "50s progression." C-Am-F-G. Nostalgic.
**vi-IV-I-V:** Am-F-C-G. Minor feel version of the pop progression.

## Rhythm

**Time signature:** Top number = beats per measure. Bottom = note value that gets one beat.
4/4: Four quarter note beats per measure. Most common.
3/4: Three beats. Waltz feel.
6/8: Six eighth-note beats. Compound duple — feels like two beats with triplet subdivision.
**Tempo:** BPM (beats per minute). 60-80 = slow. 100-120 = medium. 140+ = fast.
**Note values:** Whole = 4 beats. Half = 2. Quarter = 1. Eighth = ½. Sixteenth = ¼.

## Key signatures

Number of sharps or flats indicates the key.
Circle of Fifths: Clockwise = add a sharp. Counter-clockwise = add a flat.
C major/A minor: No sharps or flats.
G major/E minor: 1 sharp (F#).
F major/D minor: 1 flat (Bb).

Sources: musictheory.net (free, comprehensive), Khan Academy music theory (CC-BY-NC-SA), Teoria.com (free exercises), Open Music Theory (free textbook, CC-BY)