Grading a Modulation Claim in a Classical Exposition
During a unit on harmonic function, a student submits an analysis of mm. 1–16 of the first movement of Mozart's Piano Sonata in F major, K. 332. In mm. 9–12 she labels the passage "modulation to C major (V)" and supports it with two pieces of evidence: a B-flat accidental in m. 9 and a root-position C major chord in m. 12. The phrase returns to F major in m. 13 without a cadence in C. Her Roman numerals elsewhere are accurate, including a correct V7/V in m. 6. The department's grading policy awards partial credit on analysis items. A colleague argues that because the student wrote the word "modulation," the answer deserves full credit, since the answer key lists "tonicization of V." Two other students wrote the same answer. The teacher must decide how to score the item, what feedback to give all three students, and how to reteach the distinction before the unit assessment next week.
1. How should the item be scored, and what evidence should the feedback cite?
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Score it at the partial-credit level the rubric allows, not full credit.
A modulation requires three kinds of evidence: (1) a cadence, ideally a PAC, in the new key; (2) at least one chord functioning diatonically in the new key beyond the applied dominant; and (3) enough duration that the new tonic is heard as a key area rather than a chord. The student offers an accidental in m. 9 and a root-position C chord in m. 12, but no cadence in C, and the music returns to F in m. 13. That profile is a tonicization, not a key change.
The feedback should name the missing evidence, show the relabeled passage (V/V followed by V, or "applied dominant of V"), and point out that the student's other numerals-including the correct V7/V in m. 6-show the error is conceptual rather than careless. The colleague's argument conflates a keyword with the concept: "modulation" and "tonicization" both mention V, but they describe different structures, and the answer key is grading the structure.
Grade all three consistently, and record the item as a class-wide misconception rather than three isolated errors.
2. Design a 15-minute reteach sequence that lets students distinguish the two and self-correct.
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1. Listening sort (3 min). Play two four-bar excerpts: one true modulation with a PAC in the new key, one tonicization. Students hold up "key" or "chord" cards. The contrast does the initial work.
2. Guided annotation (5 min). Students mark the score with a three-question checklist: Is there a cadence in the new key? Does the new key's dominant appear as a chord or as an area? How long does the new tonic last before the original key returns?
3. Rewrite in pairs (5 min). Students relabel mm. 9–13 and complete a sentence frame: "This passage is/is not a modulation because ___." Circulate and press for cadence evidence.
4. Exit ticket (2 min). A fresh excerpt with the same checklist.
On the unit assessment, include a paired example-one modulation, one tonicization-so the misconception is detected rather than masked by a single label. That also protects students who guess correctly for the wrong reason.