The Ultimate Music Theory Cheat Sheet (Printable)

You're mid-practice, working out a chord change, and you think: "Wait, what's the formula for a Dorian scale again?" So you open a browser tab. Then another. Twenty minutes later you're watching a YouTube video about modes and you haven't played a single note.

A music theory cheat sheet solves this. One page, always next to your instrument, with the formulas and references you actually need during practice. No searching, no rabbit holes — just a quick glance and back to playing.

What's on the Cheat Sheet

The best theory cheat sheets are ruthlessly edited. You don't need everything — you need the things you look up most often. Here's what belongs on one page:

• Intervals — names, semitone counts, and sound references
• Scale formulas — major, natural minor, harmonic minor, pentatonic, blues
• Chord construction — triads, seventh chords, and common extensions
• Circle of fifths — key signatures, relative minors, and sharp/flat counts
• Common progressions — the patterns behind most songs

That's it. If it doesn't fit on one page, it's not a cheat sheet — it's a textbook.

Intervals at a Glance

Intervals are the distance between two notes. Everything in music theory — scales, chords, melodies — is built from intervals. If you know your intervals, you can figure out everything else.

• m2 (1 semitone) — minor second, the "Jaws" theme
• M2 (2 semitones) — major second, a whole step
• m3 (3 semitones) — minor third, makes chords sound sad
• M3 (4 semitones) — major third, makes chords sound happy
• P4 (5 semitones) — perfect fourth, "Here Comes the Bride"
• TT (6 semitones) — tritone, the most dissonant interval
• P5 (7 semitones) — perfect fifth, power chords
• m7 (10 semitones) — minor seventh, dominant chord flavor
• M7 (11 semitones) — major seventh, dreamy jazz sound

For a deeper dive, our complete intervals guide covers every interval with audio examples and practical applications.

Scale Formulas

Scale formulas tell you the pattern of whole steps (W) and half steps (H) that define each scale. Memorize the formula and you can build any scale in any key.

• Major: W–W–H–W–W–W–H
• Natural minor: W–H–W–W–H–W–W
• Harmonic minor: W–H–W–W–H–W+H–H (raised 7th)
• Major pentatonic: W–W–m3–W–m3 (5 notes, no tension)
• Minor pentatonic: m3–W–W–m3–W (the blues/rock scale)
• Blues: m3–W–H–H–m3–W (minor pentatonic + flat 5)

The major and minor pentatonic scales are the most practical for improvisation. If you only learn two scale shapes, learn these.

Chord Construction

Chords are built by stacking intervals on top of a root note. Once you know the formula, you can build any chord from any root.

Triads (3 notes)

• Major: R–M3–P5 (e.g., C–E–G)
• Minor: R–m3–P5 (e.g., C–E♭–G)
• Diminished: R–m3–TT (e.g., C–E♭–G♭)
• Augmented: R–M3–m6 (e.g., C–E–G♯)

Seventh chords (4 notes)

• Major 7th: R–M3–P5–M7 (Cmaj7: C–E–G–B)
• Dominant 7th: R–M3–P5–m7 (C7: C–E–G–B♭)
• Minor 7th: R–m3–P5–m7 (Cm7: C–E♭–G–B♭)
• Half-diminished: R–m3–TT–m7 (Cm7♭5: C–E♭–G♭–B♭)

Common extensions

• add9: triad + major 9th (2nd up an octave)
• sus4: replace 3rd with perfect 4th
• sus2: replace 3rd with major 2nd
• 9th: seventh chord + major 9th

Our how chords are built guide walks through each type with keyboard and fretboard diagrams.

The Circle of Fifths Mini Reference

The circle of fifths is a map of all twelve keys arranged by their relationship to each other. Moving clockwise adds one sharp; counterclockwise adds one flat. Every musician should have one within arm's reach.

On your cheat sheet, the circle of fifths tells you:

• How many sharps or flats each key has
• Which keys are closely related (adjacent on the circle)
• The relative minor of every major key (inner ring)
• Which chords are diatonic to each key

For a full explanation, see our circle of fifths guide.

Common Chord Progressions

These are the progression patterns that appear in thousands of songs. Having them on your cheat sheet means you can recognize them instantly in any key:

• I–V–vi–IV — the pop progression ("Let It Be", "Someone Like You")
• I–IV–V–I — the classic three-chord song
• ii–V–I — the jazz foundation
• I–vi–IV–V — the doo-wop / 50s progression
• vi–IV–I–V — the emotional pop ballad
• 12-bar blues — I–I–I–I–IV–IV–I–I–V–IV–I–V
• I–V–vi–iii–IV–I–IV–V — Pachelbel's Canon

How to Use It in Practice

• Keep it at your instrument. Tape it to the wall, prop it on your music stand, or slip it into the front of your songbook. The point is zero-effort access.
• Reference, don't memorize. Use it when you need it. Over weeks and months, you'll internalize the most common formulas naturally.
• Cross-reference while learning songs. When you encounter a new chord, look up its formula. When you hear a progression you like, identify it by Roman numeral. The cheat sheet makes this a 5-second task instead of a 5-minute search.
• Annotate it. Add your own notes — highlight the scales you use most, star the progressions in your favorite genre, write in mnemonic devices. Make it yours.
• Print it into your songbook. Use MakeMySongBook to include a theory reference page at the back of your printed songbook. It's always there when you need it, right alongside your songs.

Frequently Asked Questions