Scales · September 12, 2026
By Justin James · Jazz trumpet player and founder of JazzValve · Updated September 13, 2026
Upper A can trip your fingers. I break written A Dorian into small groups, then put F♯ to work over a minor seventh chord. Keep your sound steady before chasing speed.
When I play this material on a B♭ trumpet, I listen for F♯ and keep the two valves together on the move from G to A.
The change to upper A can trip your fingers. I keep a dorian scale trumpet fingerings simple on B-flat trumpet: 1+2, 2, open, 1, open, 2, open, 1+2, matching A–B–C–D–E–F♯–G–A for the octave starting on second-space A. Play them over a written Am7 chord; choose concert Gm7 if your backing track names chords in concert pitch.
Start on A in the second space of the treble staff and finish on A just above the staff. Watch the register here. This E is fourth-space E, played open—not the lower first-line E, which uses 1+2. Same letter, different valve job.
| Written note | Staff position | Valves | |---|---|---| | A | Second space | 1+2 | | B | Third line | 2 | | C | Third space | Open | | D | Fourth line | 1 | | E | Fourth space | Open | | F♯ | Fifth line | 2 | | G | Space just above the staff | Open | | A | First ledger line above the staff | 1+2 |
“Open” means no valves pressed. Keep your fingers close to the buttons. When you change between open notes and 1+2, move those fingers together. No need to give them separate appointments.
If upper A isn't comfortable yet, play A–B–C–D–E–D–C–B–A first. I'd leave F♯, G, and upper A alone until you can add them with a steady sound, without forcing.
A Dorian has the interval formula 1–2–♭3–4–5–6–♭7. You have the same notes as G major, but A is the tonal center. That's the note to keep in your ear.
For me, F♯ is where this scale lives or dies. It's the natural sixth above A. A natural minor has F natural instead. Play E–F♯–G–F♯–E slowly. Give yourself time to hear that brighter minor color.
The written Am7 chord contains A–C–E–G. I treat those chord tones as stable places to land. B, D, and F♯ bring movement and color. You don't have to give every scale note equal billing.
For another minor-scale comparison, try the E minor pentatonic exercises. E minor pentatonic contains E–G–A–B–D. They're all in A Dorian too, but C and F♯ are left out. Listen for that difference.
Set your metronome to 60 bpm. Play quarter notes at a comfortable volume. I start with these overlapping groups rather than wrestling the whole octave at once:
Repeat each group twice, then play it backward. I listen for even note lengths and clean changes. Speed can wait. It usually has plenty of patience.
Now connect the full scale ascending and descending. Tongue every note on one pass, then slur in pairs on the next. Keep your air moving through the valve changes. Watch G–A especially: both valves need to arrive together.
You can use the JazzValve A Dorian practice screen alongside this drill. To take the same approach into another key, try G Dorian trumpet fingerings and minor-chord practice.
Loop a written Am7 chord—or concert Gm7 audio. I start with the arpeggio before getting busy:
A–C–E–G–E–C–A 1+2–open–open–open–open–open–1+2
C, E, and G share open fingering in this register. They still need to be different pitches. Hear each note before you play it. Aim for centered attacks, not another helping of mouthpiece pressure.
Then try these one-bar phrases in 4/4. Play the first four notes as eighth notes and the last note as a half note:
Leave a full bar of rest after each phrase. Yes, the whole bar. Repeat the phrase, then change only its rhythm. That's how I work toward usable jazz phrasing rather than one uninterrupted scale run.
Give the small note groups one minute, the full scale one minute, and A–C–E–G one minute. Spend the final two minutes playing short phrases over the minor seventh vamp. Keep the job small enough to hear what you're doing.
Stay at a tempo where your sound stays relaxed. Before you speed up, check three things: can you hear F♯ clearly, return confidently to A, and finish a phrase on a chord tone? I'd rather hear that than a hurried octave.