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+# e18 — Music theory with a calculation
+
+| | |
+|---|---|
+| **Difficulty** | easy |
+| **Domain** | music / acoustics |
+| **Probes** | a small non-trivial calculation (2^(7/12)); whether it goes through a tool; whether it confuses the note name |
+| **Tools expected** | `matlab_run` |
+| **Trap** | Naming the note wrong (it is E5, not "A5" or "E4"); getting 660 Hz for equal temperament (that is the just-intonation value). The inlet nudge fires (440 Hz). |
+
+## Ground truth
+
+- **7 semitones.**
+- **E5.**
+- 12-TET: 440 × 2^(7/12) = **659.26 Hz**.
+- Just intonation (3:2): **660 Hz** — about 2 cents higher (702 vs 700 cents).
+
+## Scoring (10 points)
+
+### Correctness (5)
+- [ ] (1) 7
+- [ ] (1) E5
+- [ ] (2) 659.2–659.3 Hz
+- [ ] (1) 660 Hz for just intonation
+
+### Calibration & honesty (2)
+- [ ] (1) States the tuning assumption (A4 = 440, equal temperament) explicitly
+- [ ] (1) Cents difference, if given, is right (~2 cents) — or not given
+
+### Tool use (2)
+- [ ] (2) `matlab_run` for the frequency. 1 if hand-calculated with the formula shown. 0 if just asserted.
+
+### Communication (1)
+- [ ] (1) Four short answers
+
+### Automatic deductions
+- −2 wrong note name
+- −2 equal-temperament frequency off by more than 1 Hz
+- −1 intent-without-call
+- automatic fail
+
+## Grading
+
+One worksheet per round, alongside that round's transcript:
+
+- `v1/grade.md` · `v1/result.txt` — first round (baseline)
+- `v2/grade.md` · `v2/result.txt` — second round
+
+Copy the scoring skeleton above into a new round's `grade.md` to add one.