The Hollow Third in a Recorded Wind Ensemble Run
You teach a 54-member high school wind ensemble that meets 50 minutes daily. The group is preparing a Grade 4 festival program in six weeks. You record a run of the slow middle movement with a single condenser microphone placed 12 feet above and in front of the ensemble. Listening back, measures 41–49-a sustained E-flat major chord scored for clarinets, horns, and trombones-sound hollow: the major third is weak, the chord seems to spread, and the trombones dominate. Individually, the clarinetists' tuner readings are within 3 cents. The horn player on the third has a history of stopping the phrase early; the trombone section is playing at a healthy forte. You have 18 minutes of the next rehearsal to address this before a run-through with the choir. Your principal asks how you know the recording is a valid assessment.
1. From the recording and score, identify at least three plausible causes of the hollow third and describe what you would listen for in a second recorded pass to distinguish among them.
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The hollow third is an ensemble phenomenon, not simply an individual tuning error. Three causes fit the evidence.
- Equal-temperament versus just chord intonation. Individually 'in tune' clarinets can still produce a third that is roughly 14 cents sharp relative to a just major third; the chord then sounds spread even though every tuner reads green. A tuner measures a single pitch against equal temperament, not one chord member against another.
- Balance and voicing. Trombones at forte on roots and fifths can mask the third, especially if the third is carried by clarinets and horns. The microphone placement also favors forward-facing bells.
- Release and sustain. The horn player's early release leaves the third unsupported for the final beat or two.
To distinguish these in a second pass, record from the podium at ear height and add a spot microphone on clarinets and horns. Have clarinets sustain the chord alone, then add horns, then add trombones at mezzo-piano. Listen for beating between the third and fifth, for a dropout at the release, and for improvement when the trombones drop dynamic. If the third locks with a drone and softer trombones, the issue is chord intonation and voicing, not the clarinetists' tuners.
2. Design an 18-minute rehearsal sequence that addresses the problem and explains why you ordered the steps as you did.
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Use a simple-to-complex sequence so students hear the cause before they try to fix the full texture.
- 0–2 minutes: Establish a concert E-flat drone and a B-flat fifth. Have the full ensemble hum or sing the root and fifth softly. No chord yet.
- 2–6 minutes: Clarinets alone. Ask them to play the third against the drone and lower it by ear until the beats disappear. Do not let them watch tuners for this step.
- 6–10 minutes: Add horns. The horn on the third must match the clarinet third, not overpower it. Rehearse the full value and release.
- 10–13 minutes: Add trombones at mezzo-piano. Ask them to listen for the third above them rather than play 'their' chord.
- 13–16 minutes: Full chord with a written dynamic plan. Mark the trombones down and the third up slightly.
- 16–18 minutes: Record the same eight bars and compare with the first recording.
The order moves from sustained pitch to chord, from soft to full, and from section to ensemble. It avoids spending the 18 minutes talking or running the movement, which would repeat the same habit.
3. How would you use the recordings as assessment evidence for students and for your principal?
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Treat the recording as one source of evidence, not a verdict. Keep microphone placement and gain constant, record the same eight bars before and after, and use a short rubric: ensemble balance, chord intonation, sustain and release, and dynamic control. Have students listen to the excerpt and mark one place where they hear the third disappear; this makes the assessment formative and ties it to rehearsal decisions.
For the principal, explain that a single microphone is not a neutral listener: it favors forward-facing bells and can exaggerate the trombones. Triangulate with live listening from three seats in the hall and with a section recording. Explain that the recording is valid for comparing the ensemble to itself under the same conditions, not for grading individual students. Use it to document growth across two weeks and to justify the rehearsal sequence, not to replace the director's live ear.