Learn Music Theory

Guitar Chord Lookup

Type any chord name and see every possible guitar fingering, rendered as chord diagrams. Works for all standard chord types.

Scale Generator

Generate any major or minor scale, its pentatonic subset, diatonic triads, and relative key — for all 12 root notes.

Name That Chord

Click notes on a guitar fretboard and instantly identify the chord. Works for any combination of 2 or more notes.

Name That Key

Select chords and find the key they belong to. The circle of fifths highlights every matching major and minor key.

Ear Training

Practice interval recognition by ear. Hear two notes and identify the interval — from unison to octave.

12 Bar Blues

The 12 bar blues is one of the most used chord progressions in popular music. Learn the structure, variations, and how to use it in your own songs.

Clefs

Clefs tell you which notes are on the staff lines. Learn the treble and bass clef, how to read them, and when each one is used.

Creating Diatonic Chord Progressions

Diatonic chord progressions stay within a single key. Learn how to build them from any major or minor scale and why they sound so natural together.

Extended Chords

Extended chords add color and tension beyond the basic triad. Learn what 7ths, 9ths, 11ths, and 13ths are and how to use them in your progressions.

Intervals in Western Music Theory

An interval is the distance between two notes. Learn how to identify and name intervals by ear and on paper.

Key Signatures

Key signatures tell you which notes are sharp or flat throughout a piece. Learn to read every major and minor key signature.

Major Diatonic Chords

Every major key has seven chords built from its scale. Learn which chords are major, minor, and diminished — and how to use them together.

Major Scales

The major scale is the foundation of Western music theory. Learn the pattern of whole and half steps that builds any major scale.

List of All Major Scales

A complete list of all 12 major scales with notes, diatonic triads, and relative minor keys — in order of fifths.

Minor Scales

Minor scales have a darker, more melancholic sound than major. Learn the natural, harmonic, and melodic minor scales.

List of All Natural Minor Scales

A complete list of all 12 natural minor scales with notes, diatonic triads, and relative major keys — in order of fifths.

Pentatonic Scales

Pentatonic scales are five-note scales used in blues, rock, and folk. Learn the major and minor pentatonic patterns and where to use them.

Sharps and Flats

Sharps raise a note by a half step; flats lower it. Learn how to read and write accidentals and why they matter in any key.

The Circle of Fifths

The circle of fifths maps all 12 keys and their relationships. Learn to use it to find key signatures, modulate, and understand chord progressions.

The Staff

The staff is the foundation of written music. Learn the five lines, four spaces, and how notes are placed to represent pitch.

Time Signatures

Time signatures tell you how many beats are in each measure. Learn common signatures like 4/4, 3/4, and 6/8 and how they shape the feel of music.

Triads

A triad is a three-note chord built from a root, third, and fifth. Learn the four triad types — major, minor, diminished, and augmented.