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Music
Grade 9-12
Jazz Chord Symbols Reference Cheat Sheet
A printable reference covering jazz chord symbols, seventh chords, extensions, alterations, slash chords, and piano voicing shortcuts for grades 9-12.
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Jazz chord symbols are a compact way to show harmony, chord quality, extensions, alterations, and bass notes. Students need this cheat sheet because lead sheets often give only symbols, not fully written-out notes. Knowing how to decode each symbol helps performers build accurate chords quickly at the piano, on guitar, or in an ensemble.
Key Facts
- A major seventh chord uses the formula 1, 3, 5, 7 and is often written Cmaj7, CΔ7, or CM7.
- A dominant seventh chord uses the formula 1, 3, 5, b7 and is written C7.
- A minor seventh chord uses the formula 1, b3, 5, b7 and is written Cm7, Cmin7, or C-7.
- A half-diminished seventh chord uses the formula 1, b3, b5, b7 and is written Cm7b5 or Cø7.
- A fully diminished seventh chord uses the formula 1, b3, b5, bb7 and is written Cdim7 or C°7.
- Extensions continue above the seventh: 9 equals the 2nd, 11 equals the 4th, and 13 equals the 6th.
- Alterations change chord tones or extensions, such as b5, #5, b9, #9, #11, or b13.
- A slash chord such as Cmaj7/E means play a Cmaj7 chord with E as the bass note.
Vocabulary
- Chord symbol
- A shorthand label that tells the performer the root, chord quality, extensions, alterations, and sometimes the bass note.
- Root
- The root is the note that names the chord and acts as its main harmonic center.
- Chord quality
- Chord quality describes the basic type of chord, such as major, minor, dominant, diminished, or half-diminished.
- Extension
- An extension is a chord tone above the seventh, commonly the 9th, 11th, or 13th.
- Alteration
- An alteration is a raised or lowered chord tone or extension, such as b9, #9, #11, or b13.
- Voicing
- A voicing is the specific arrangement of chord tones across notes or instruments.
Common Mistakes to Avoid
- Confusing Cmaj7 with C7 is wrong because Cmaj7 has B natural while C7 has Bb.
- Reading Cm7b5 as a fully diminished chord is wrong because Cm7b5 has a b7, while Cdim7 has a bb7.
- Playing every extension in the symbol without checking the chord quality can create clutter because the 3rd and 7th usually define the harmony most clearly.
- Ignoring the slash note in a chord like Dm7/G is wrong because the note after the slash tells the required bass note.
- Treating 9, 11, and 13 as separate low notes is wrong because extensions represent chord tones above the octave, even when they are rearranged in a voicing.
Practice Questions
- 1 Write the notes in Cmaj7 using the formula 1, 3, 5, 7.
- 2 Write the notes in G7b9 using the formula 1, 3, 5, b7, b9.
- 3 Identify the chord quality and chord tones of Bm7b5.
- 4 Explain why the 3rd and 7th are often more important than the 5th when creating a simple jazz piano voicing.