Music Theory

Music theory is what piano players use to make sense of the keys under their hands: the scale, the key signature, the chords a key contains, and how to read all of it off the page. Every page in this section is interactive sheet music, so each idea can be played and heard rather than memorized.

If you press the right keys and the result still sounds robotic, the missing piece is usually theory rather than talent. Theory is what lets your hands and your ear agree with the page about what is happening. None of it has to stay abstract. You learn it the way you learn a piece, by playing a short example, hearing the result, and repeating it until it sticks. With Chordzy that happens in the browser or in the app.

What music theory does for your playing

What music theory does for your playing What music theory does for your playing Watch on YouTube

Music theory is a map. It says why some notes sound stable and others make tension, and how a piece wants to move on from where it is. On the piano the map is visual and it repeats every octave, so what you learn in one key transfers to the next.

In practice, piano theory for piano players means you read faster, because you see a G major chord instead of three separate notes. It means you memorize more securely, because you know the piece goes to the dominant before it comes home. It means you can recover when you miss a note, because you know what the harmony allows (yes, everyone misses notes). And it means better phrasing, because your ear knows what it is aiming at.

Major and minor: the mood switch you can hear

Major and minor are sound worlds rather than labels. Major usually comes across as brighter or more settled, minor as darker or more tense, and it is your ears that decide which is which, never the adjectives.

There is a test that takes about ten seconds. Play C–E–G, which is C major. Then lower the E to E♭ and play C–E♭–G, which is C minor. The outer notes have not moved. One note in the middle went down a semitone, and you are in a different world. I still find that a slightly unreasonable amount of change for one key, and it is the door into most of piano music theory.

The major scale: your first map

The major scale is the pattern the rest of the theory hangs from, and the home base for melody and harmony. Its step pattern is:

Whole, Whole, Half, Whole, Whole, Whole, Half

On C it uses only the white keys, C D E F G A B C. Once your fingers know the shape and your ear knows the sound, you can start it on any note and get that note's major scale, and that is the point where theory stops being academic.

The minor scale: same letters, different gravity

Minor scales come in three common types (natural, harmonic, melodic). Start with one. The natural minor is the clearest introduction, and it shows how changing a scale degree changes the pull of the music.

A minor uses the same notes as C major, with no sharps or flats, but it is centered on A: A B C D E F G A. Same piano keys, different home note, and that shift of home is most of why minor feels different under the hands and in the ear.

Piano scales: how to practice without wasting time

A piano scale done properly is technique, ear training and reading practice at the same time. The efficient way to work at one:

  1. Hands separately first, slowly enough to stay loose.
  2. A steady pulse. If you rush, your fingers will lie to you about what they can do.
  3. Say the note names out loud sometimes. It is oddly powerful.
  4. Add one goal per run: an even tone, quiet shoulders, no thumb thumps.

Then play it once legato, once staccato, and once a bit faster for fun. What you get from that is control, and the speed comes along with it. Every major and minor scale has its own page with the fingering for both hands at piano scales.

Triads: the chords hiding inside the scale

Scales are the alphabet and triads are the first words. A triad stacks thirds: root, third, fifth. In a major key the major triad sounds stable and finished, and the minor triad sounds more complex, with a tug of tension in it.

Example:

  • C major triad: C–E–G
  • C minor triad: C–E♭–G

Once you can build these quickly you start reading chords in sheet music instead of every note separately, which is the biggest single jump in reading speed there is. The seven triads of every key are spelled out, with a keyboard to press for each one, on pages like C major triad chords, and every chord by name is in the piano chords dictionary.

Related Topics...

  • Sheet Music: Free piano sheet music, hand-picked so it reads easily and sounds good: scales, chords, beginner songs, folk tunes, Beethoven. Download PDFs or play in Chordzy.

Readers Also Look For

  • B Major Scale (Piano): The B major scale is B C♯ D♯ E F♯ G♯ A♯ B, with five sharps (F♯, C♯, G♯, D♯, A♯). Notes, piano fingering for both hands, key signature and chords. Play it here.

  • C Major Scale (Piano): The C major scale is C D E F G A B C, with no sharps and no flats. Notes, piano fingering for both hands, key signature and chords. Play it here.

More in This Section

  • Key of A Flat Major: The key of A Flat Major: four flats (B♭, E♭, A♭, D♭), the notes A♭ B♭ C D♭ E♭ F G, and all seven chords, A♭, B♭m, Cm, D♭, E♭, Fm, Gdim.

  • Key of A Major: The key of A Major: three sharps (F♯, C♯, G♯), the notes A B C♯ D E F♯ G♯, and all seven chords, A, Bm, C♯m, D, E, F♯m, G♯dim.

  • Key of A Minor: The key of A Minor: no sharps and no flats, the notes A B C D E F G, and all seven chords, Am, Bdim, C, Dm, Em, F, G.

  • Key of B Flat Major: The key of B Flat Major: two flats (B♭, E♭), the notes B♭ C D E♭ F G A, and all seven chords, B♭, Cm, Dm, E♭, F, Gm, Adim.

  • Key of B Flat Minor: The key of B Flat Minor: five flats (B♭, E♭, A♭, D♭, G♭), the notes B♭ C D♭ E♭ F G♭ A♭, and all seven chords, B♭m, Cdim, D♭, E♭m, Fm, G♭, A♭.

  • Key of B Major: The key of B Major: five sharps (F♯, C♯, G♯, D♯, A♯), the notes B C♯ D♯ E F♯ G♯ A♯, and all seven chords, B, C♯m, D♯m, E, F♯, G♯m, A♯dim.

  • Key of B Minor: The key of B Minor: two sharps (F♯, C♯), the notes B C♯ D E F♯ G A, and all seven chords, Bm, C♯dim, D, Em, F♯m, G, A.

  • Key of C Major: The key of C Major: no sharps and no flats, the notes C D E F G A B, and all seven chords, C, Dm, Em, F, G, Am, Bdim.

  • Key of C Minor: The key of C Minor: three flats (B♭, E♭, A♭), the notes C D E♭ F G A♭ B♭, and all seven chords, Cm, Ddim, E♭, Fm, Gm, A♭, B♭.

  • Key of C Sharp Minor: The key of C Sharp Minor: four sharps (F♯, C♯, G♯, D♯), the notes C♯ D♯ E F♯ G♯ A B, and all seven chords, C♯m, D♯dim, E, F♯m, G♯m, A, B.

  • Key of D Flat Major: The key of D Flat Major: five flats (B♭, E♭, A♭, D♭, G♭), the notes D♭ E♭ F G♭ A♭ B♭ C, and all seven chords, D♭, E♭m, Fm, G♭, A♭, B♭m, Cdim.

  • Key of D Major: The key of D Major: two sharps (F♯, C♯), the notes D E F♯ G A B C♯, and all seven chords, D, Em, F♯m, G, A, Bm, C♯dim.

  • Key of D Minor: The key of D Minor: one flat (B♭), the notes D E F G A B♭ C, and all seven chords, Dm, Edim, F, Gm, Am, B♭, C.

  • Key of E Flat Major: The key of E Flat Major: three flats (B♭, E♭, A♭), the notes E♭ F G A♭ B♭ C D, and all seven chords, E♭, Fm, Gm, A♭, B♭, Cm, Ddim.

  • Key of E Flat Minor: The key of E Flat Minor: six flats (B♭, E♭, A♭, D♭, G♭, C♭), the notes E♭ F G♭ A♭ B♭ C♭ D♭, and all seven chords, E♭m, Fdim, G♭, A♭m, B♭m, C♭, D♭.

  • Key of E Major: The key of E Major: four sharps (F♯, C♯, G♯, D♯), the notes E F♯ G♯ A B C♯ D♯, and all seven chords, E, F♯m, G♯m, A, B, C♯m, D♯dim.

  • Key of E Minor: The key of E Minor: one sharp (F♯), the notes E F♯ G A B C D, and all seven chords, Em, F♯dim, G, Am, Bm, C, D.

  • Key of F Major: The key of F Major: one flat (B♭), the notes F G A B♭ C D E, and all seven chords, F, Gm, Am, B♭, C, Dm, Edim.

  • Key of F Minor: The key of F Minor: four flats (B♭, E♭, A♭, D♭), the notes F G A♭ B♭ C D♭ E♭, and all seven chords, Fm, Gdim, A♭, B♭m, Cm, D♭, E♭.

  • Key of F Sharp Minor: The key of F Sharp Minor: three sharps (F♯, C♯, G♯), the notes F♯ G♯ A B C♯ D E, and all seven chords, F♯m, G♯dim, A, Bm, C♯m, D, E.

  • Key of G Flat Major: The key of G Flat Major: six flats (B♭, E♭, A♭, D♭, G♭, C♭), the notes G♭ A♭ B♭ C♭ D♭ E♭ F, and all seven chords, G♭, A♭m, B♭m, C♭, D♭, E♭m, Fdim.

  • Key of G Major: The key of G Major: one sharp (F♯), the notes G A B C D E F♯, and all seven chords, G, Am, Bm, C, D, Em, F♯dim.

  • Key of G Minor: The key of G Minor: two flats (B♭, E♭), the notes G A B♭ C D E♭ F, and all seven chords, Gm, Adim, B♭, Cm, Dm, E♭, F.

  • Key of G Sharp Minor: The key of G Sharp Minor: five sharps (F♯, C♯, G♯, D♯, A♯), the notes G♯ A♯ B C♯ D♯ E F♯, and all seven chords, G♯m, A♯dim, B, C♯m, D♯m, E, F♯.

  • Piano Chords: Every piano chord, spelled out and playable: 12 roots across major, minor, diminished, augmented, 7th, maj7, m7, sus2, sus4 and add9.

  • Piano Scales: Every piano scale in one chart: the notes, the key signature and the number of sharps or flats for all twelve major and twelve minor keys.

Major and Minor Exercises

  • Major scales on piano: Learn the major scale pattern on piano, then compare the key signatures and fingering groups for every major scale.

  • The Major Triad Chords: A major triad is a root plus the notes four and seven semitones above it. The seven triad chords of a major key, spelled out and playable with Chordzy.

  • The Minor Scale: Learn the minor scales... including interactive sheet music, videos, music theory, and recordings.

  • The Minor Triad Chords: All minor triad chords use the pattern i-ii°-III-iv-v-VI-VII. Learn what that means, and how to play each chord interactively with Chordzy.