Major Scales & Chords Builder
One simple pattern builds every major scale, and the same pattern decides which chords belong in a key. Pick a key, watch the scale build step by step, stack triads, and hear why every major key follows the same order of chord qualities.
The Major Scale Formula
Every major scale follows the same pattern of whole steps (W) and half steps (H) : W – W – H – W – W – W – H . A half step is the very next key on the piano, black or white. A whole step skips one key.
Stack Thirds to Make Triads
A triad is three notes stacked in thirds. Start on any note of the scale, skip one, take the next, skip one, take the next: notes 1, 3, and 5 counting from that note. Only notes from the scale are used.
The three triad qualities in a major key
| Quality | Bottom third | Top third | Sound |
|---|---|---|---|
| Major | Major (4 half steps) | Minor (3) | Bright, settled |
| Minor | Minor (3) | Major (4) | Darker, softer |
| Diminished | Minor (3) | Minor (3) | Tense, unstable |
Because the scale’s half steps sit in fixed places, each scale degree always gets the same kind of triad, in every major key.
The Order of Chord Qualities
Every major key has the same chord pattern: Major, minor, minor, Major, Major, minor, diminished . Roman numerals show this: uppercase for major, lowercase for minor, and ° for diminished. Tap any chord to hear it.
Hear It in Real Progressions
Thousands of songs use the same few chord patterns. Because the numbers stay the same in every key, learning one progression means you already know it in all 12 keys.
Practice Ideas
Say it, then play it
Pick a new key, say the W–W–H–W–W–W–H pattern out loud, and name each note before you build it. Check yourself with the tool.
One progression, three keys
Play I–V–vi–IV in C, then G, then D. The chord names change, but the sound and the numbers stay the same.
Find the odd one out
Play the vii° chord in any key and listen to how it wants to move. It usually resolves up to the I chord.
Want to Put This Theory to Work?
Our teachers connect music theory to the songs you actually want to play, on piano, guitar, voice, and more. Private lessons for every age at our Ann Arbor studio.