Hard Bop · October 30, 2026
By Justin Comstock · JazzValve creator, longtime guitarist and adult trumpet learner · Updated October 30, 2026
Secondary Dominants for Trumpet: Know Where the Next Chord Is Going
Recognize secondary dominants in a trumpet chart, read V7/V and V7/vi, and hear their destinations in two short written-pitch studies.
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Get Blue Lines freeSecondary dominants help you hear where a chord is going, not just which notes it contains. On trumpet, that can mean noticing one changed note and aiming it at the next chord before you think about a whole scale.
This lesson is for players who can read basic seventh-chord symbols and want to understand unexpected dominant chords in a major-key chart. All pitches and chord symbols are written for B-flat trumpet, except the explicitly labeled concert-accompaniment progressions. Written C sounds concert B-flat, a whole step lower.
What is a secondary dominant?
A secondary dominant is a major triad or dominant-seventh chord acting as the dominant of a chord other than the home tonic. It briefly makes that other chord sound like a destination. This local emphasis is called tonicization; it does not by itself establish a lasting change of key. Robert Hutchinson's explanation of tonicization introduces this distinction between the home tonic and a temporary target.
In written C major, compare these two moves:
| Chord movement | Destination | Function in C major |
|---|---|---|
| G7 → Cmaj7 | C, the home tonic | Primary dominant: V7 → Imaj7 |
| D7 → G7 | G, the dominant of C | Secondary dominant: V7/V → V7 |
D7 contains D–F-sharp–A–C. Its F-sharp is outside the C-major scale and helps point toward G. G7 contains G–B–D–F; it already belongs to C major and points toward C. Both are dominant-seventh chords, but they have different jobs in this key.
If the difference between a plain 7, maj7 and m7 is still uncertain, start with the jazz chord-symbol guide.
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Read the destination after the slash
Read V7/V aloud as “five-seven of five.” The numeral after the slash identifies the target; the part before it identifies that target's dominant. This is Roman-numeral analysis, not a bass-note instruction like D7/F-sharp. Open Music Theory's applied-chord chapter explains this notation.
In written C major:
- V7/V targets G: the chord is D7.
- V7/vi targets A minor: the chord is E7.
- V7/ii targets D minor: the chord is A7.
The last example appears in the turnaround-lick lesson. Here, use the first two to practise recognizing a destination rather than memorizing another A7 phrase.
Do not label every chord with a 7 as a secondary dominant. First establish the home key, then consider the chord's relationship to its target. The same E7 could be a secondary dominant in C major or the primary dominant in A minor.
Study 1: Find the dominant of the dominant
The first original study uses Cmaj7 | D7 | G7 | Cmaj7, with one chord per bar. Before playing, say “home, toward G, toward C, home.” The important move is F-sharp4 at the end of bar 2 to G4 at the start of bar 3.
Read the note and rhythm transcript below. Staff notation requires JavaScript.
Notes, rhythm and playing instructions
- Bar 1: beat 1, chord Cmaj7, C4 quarter note, sounds B-flat3; beat 2, E4 quarter note, sounds D4; beat 3, G4 half note, sounds F4.
- Bar 2: beat 1, chord D7, D4 quarter note, sounds C4; beat 2, A4 quarter note, sounds G4; beat 3, F-sharp4 half note, sounds E4.
- Bar 3: beat 1, chord G7, G4 half note, sounds F4; beat 3, F4 quarter note, sounds E-flat4; beat 4, D4 quarter note, sounds C4.
- Bar 4: beat 1, chord Cmaj7, E4 half note, sounds D4; beat 3, half rest.
Written for B-flat trumpet; notes and chord symbols sound a major second lower. Hear F-sharp4 resolve up to G4. D7 is V7/V; G7 is the primary V7. F4 in bar 3 is natural. Hold the final E4 for two beats, then rest for two beats. Concert accompaniment: B-flatmaj7 | C7 | F7 | B-flatmaj7.
Use 4/4, quarter note = 60, with a metronome click on every beat. Play the quarters and halves evenly; there are no swung eighth notes in these studies. A quarter note lasts one beat; a half note lasts two. C4 is middle C below the treble staff. Both studies stay within written C4–B4.
| Bar | Written chord | Exact written notes and durations |
|---|---|---|
| 1 | Cmaj7 | C4 quarter, E4 quarter, G4 half |
| 2 | D7 | D4 quarter, A4 quarter, F-sharp4 half |
| 3 | G7 | G4 half, F4 quarter, D4 quarter |
| 4 | Cmaj7 | E4 half, half rest |
Each bar totals four beats. Count the final rest; then rest longer before repeating if needed. You can also learn bars 2–3 alone, taking a full bar off between attempts. Do not force a four-bar breath.
For accompaniment, use concert B-flatmaj7 | C7 | F7 | B-flatmaj7, one bar each. A generic concert B-flat major backing track may have different changes; it is not automatically a match. A metronome alone is enough to learn the notes. Matching chords on a keyboard or accompaniment help you hear their function.
Now make one controlled comparison: replace bar 2's D7 with Dm7, and play F4 instead of F-sharp4. Keep everything else unchanged. The concert chord in that bar becomes Cm7. Compare F–G with F-sharp–G: the first rises a whole step, the second a half step. Restore D7 and its F-sharp afterward. This is the difference between the ordinary ii7 and V7/V here, not a license to swap them without checking the chart.
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Study 2: Recognize a minor destination
A secondary dominant can point toward a minor chord. In the next study, E7 leads to Am7, the vi7 chord in written C major. E7 is E–G-sharp–B–D; G-sharp is the note to notice. The target chord is A–C–E–G, so its G is natural again.
Read the note and rhythm transcript below. Staff notation requires JavaScript.
Notes, rhythm and playing instructions
- Bar 1: beat 1, chord Cmaj7, C4 quarter note, sounds B-flat3; beat 2, E4 quarter note, sounds D4; beat 3, G4 half note, sounds F4.
- Bar 2: beat 1, chord E7, E4 quarter note, sounds D4; beat 2, B4 quarter note, sounds A4; beat 3, G-sharp4 half note, sounds F-sharp4.
- Bar 3: beat 1, chord Am7, A4 half note, sounds G4; beat 3, G4 quarter note, sounds F4; beat 4, E4 quarter note, sounds D4.
- Bar 4: beat 1, chord Cmaj7, E4 half note, sounds D4; beat 3, half rest.
Written for B-flat trumpet; notes and chord symbols sound a major second lower. Hear G-sharp4 resolve up to A4. E7 is V7/vi. G4 in bar 3 is natural. Hold the final E4 for two beats, then rest for two beats. Concert accompaniment: B-flatmaj7 | D7 | Gm7 | B-flatmaj7.
Keep the same meter and tempo. The opening and ending stay the same so you can concentrate on the changed middle.
| Bar | Written chord | Exact written notes and durations |
|---|---|---|
| 1 | Cmaj7 | C4 quarter, E4 quarter, G4 half |
| 2 | E7 | E4 quarter, B4 quarter, G-sharp4 half |
| 3 | Am7 | A4 half, G4 quarter, E4 quarter |
| 4 | Cmaj7 | E4 half, half rest |
For accompaniment, use concert B-flatmaj7 | D7 | Gm7 | B-flatmaj7, one bar each. Every bar again totals four beats.
Before playing, sing or hum the sound of the written G-sharp–A arrival in a comfortable register. If checking it on a piano, use concert F-sharp–G. On the horn, let G-sharp lead into A without making A louder just because it is the target. In bar 3, return to G-natural on beat 3; do not carry the previous bar's sharp into the Am7 sound.
These two melodies choose the dominant's third rising a half step to the next root. That is one useful route, not a rule for every jazz line. For example, D7–G7 can also support F-sharp–F-natural, moving from D7's third to G7's seventh. Open Music Theory discusses this alternative when an applied dominant resolves to another seventh chord. The guide-tone lesson develops other small connections.
Transfer the idea to a chart
Choose a short passage from a chart you are already learning. Work without the horn first:
- Confirm the pitch system. Are its chord symbols concert pitch or written for B-flat trumpet?
- Establish the local home key. A key signature alone may not explain every passage.
- Circle a possible dominant and look ahead. For a straightforward example, its target root will be a perfect fifth below it, or a perfect fourth above it. D points to G; E points to A.
- Check the chord quality and context. Dm7 is not the same chord as D7. If the expected target does not appear, do not force this beginner analysis onto the passage.
- Mark one arrival note and its beat. Play only the approach and arrival, leaving the rest silent. Add the surrounding melody afterward.
The quality-and-root checks follow the approach in Hutchinson's Analyzing Secondary Dominants. Real charts can delay or redirect a resolution; start with a clear adjacent pair before tackling those cases.
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Finish by covering the note tables and answering three questions: where does D7 point in Study 1, where does E7 point in Study 2, and why is G7 not secondary in the first study? Then play just the two half-step arrivals. If you can name the destinations and reach them in time, the symbols are starting to mean something you can hear.
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Get Blue Lines freeSources
- Music Theory for the 21st-Century Classroom: Tonicization
- Open Music Theory: Applied chords
- Music Theory for the 21st-Century Classroom: Analyzing Secondary Dominants