The Transposed Dictation: Hearing Through a Modulating Melody
In an aural skills class, students hear a four-bar melody played twice on piano. The melody begins on G, uses the notes G–A–B–D–E in the first two bars, then in bars 3–4 introduces F natural and C natural, ending on G. Students are asked to notate the melody, identify its tonality, and describe what happens harmonically between bars 2 and 3. One student writes the melody in G major with an F sharp throughout, another writes it in C major starting on the dominant, and a third notates it correctly but says the tonality is 'ambiguous'. The melody is played only twice, at a moderate tempo, with no harmonic accompaniment.
1. Evaluate each student's response against the melodic evidence, and determine the most defensible tonal analysis.
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The evidence is the pitch content: G, A, B, D, E in bars 1–2, then F natural and C natural in bars 3–4, ending on G.
Student 1 (G major, F sharp throughout) has misheard or assumed the F. The melody contains F natural, not F sharp. Writing F sharp contradicts the sounded pitch and would produce a different scale. This is a transcription error, not an interpretive choice.
Student 2 (C major starting on the dominant) has a partial case: the pitch set G–A–B–C–D–E–F is the C major collection, and G is the dominant of C. But the melody ends on G, and the first two bars emphasise G–B–D–E, which outline a G-centred sonority. Hearing the whole melody as C major requires the final G to be an unresolved dominant, which the ending does not support. Student 2 has heard the collection correctly but assigned the wrong centre.
Student 3 (correct notation, 'ambiguous') is the most defensible. The melody uses the G Mixolydian collection: G–A–B–C–D–E–F, with G as tonic and F natural as the subtonic. The absence of F sharp means the leading tone is missing, so the melody does not confirm G major by tonal function. The shift between bars 2 and 3 is best described as the introduction of the subtonic and subdominant degrees, which modalise the melody rather than modulate it. Calling this 'ambiguous' is reasonable if it is explained as modal rather than functional-tonal; the student should refine the wording to 'G Mixolydian' to show understanding.
2. Explain why the melody is difficult to identify tonally when heard only twice without accompaniment, and what listening strategy would help.
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The difficulty has several causes.
- No harmonic support. Without chords, the listener has no functional anchor. In tonal music, harmony confirms the tonic; here the listener must infer the centre from melodic emphasis alone, which is slower and less reliable.
- The missing leading tone. F natural instead of F sharp removes the strongest tonal signal in G. A listener expecting major will hear the F natural as an anomaly and may try to reinterpret the whole melody in another key - which is exactly what Student 2 did.
- Two hearings is minimal. The melody is four bars at moderate tempo, so each hearing gives roughly ten to fifteen seconds of material. That is enough to catch the contour and the final note but not necessarily the altered degree in bars 3–4, which is the crucial evidence.
- The ending on G is a strong but not decisive cue. Listeners overweight the final note; it points to G, but the F natural then makes the mode uncertain.
A better strategy: on the first hearing, fix the final note and the contour; on the second hearing, listen specifically for the third and seventh degrees, since these determine mode. Humming back the last two bars silently during the pause helps retain the altered pitch. Writing the scale collection first and the rhythm second avoids committing to a key before the evidence is in.
3. The third student's notation is correct but the analysis says 'ambiguous'. Explain how the student should revise the analysis to demonstrate aural understanding rather than uncertainty.
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The student should replace 'ambiguous' with a specific modal description and show the evidence.
A revised analysis: 'The melody is in G Mixolydian. The first two bars outline G–B–D–E, establishing G as the centre. Bars 3–4 introduce F natural and C natural, which are the subtonic and subdominant of G Mixolydian and which replace the leading tone of G major. Because the leading tone is absent, the melody does not confirm G major functionally; the mode is established by the lowered seventh. The final G confirms the tonic.'
This is stronger than 'ambiguous' for three reasons:
- It names the mode and the defining scale degree (the lowered seventh).
- It explains the function of the notes in bars 3–4 rather than merely noting that they are unexpected.
- It distinguishes modal from tonal hearing, which is the conceptual point the exercise is testing.
The student should also note what would change the analysis: if an F sharp were present, or if the melody ended on C, the reading would differ. Stating the conditions under which the analysis would fail demonstrates control of the evidence rather than uncertainty about it.