---
id: T01
parent: S05
milestone: M006
provides: []
requires: []
affects: []
key_files: ["config/canonical_tags.yaml", "frontend/src/App.css"]
key_decisions: ["Used warm orange-gold (#3b2506 bg, #fdba74 text) for Music Theory badges — visually distinct from existing 6 category colors"]
patterns_established: []
drill_down_paths: []
observability_surfaces: []
duration: ""
verification_result: "API returns 7 categories including Music Theory (curl + json assertion). CSS contains music-theory badge rules (grep). Frontend build succeeds with no errors (npm run build, 770ms)."
completed_at: 2026-03-30T11:44:11.651Z
blocker_discovered: false
---

# T01: Added Music Theory as 7th category in canonical_tags.yaml with 8 sub-topics, plus warm orange-gold badge CSS in App.css

> Added Music Theory as 7th category in canonical_tags.yaml with 8 sub-topics, plus warm orange-gold badge CSS in App.css

## What Happened
---
id: T01
parent: S05
milestone: M006
key_files:
  - config/canonical_tags.yaml
  - frontend/src/App.css
key_decisions:
  - Used warm orange-gold (#3b2506 bg, #fdba74 text) for Music Theory badges — visually distinct from existing 6 category colors
duration: ""
verification_result: passed
completed_at: 2026-03-30T11:44:11.652Z
blocker_discovered: false
---

# T01: Added Music Theory as 7th category in canonical_tags.yaml with 8 sub-topics, plus warm orange-gold badge CSS in App.css

**Added Music Theory as 7th category in canonical_tags.yaml with 8 sub-topics, plus warm orange-gold badge CSS in App.css**

## What Happened

Edited canonical_tags.yaml on ub01 to add Music Theory as the 7th category with sub-topics (harmony, chord progressions, scales, rhythm, time signatures, melody, counterpoint, song keys). The API immediately reflected the change — no restart needed. Added CSS custom properties (--color-badge-cat-music-theory-bg: #3b2506, --color-badge-cat-music-theory-text: #fdba74) and .badge--cat-music-theory class rule to frontend/src/App.css. Frontend build passes cleanly.

## Verification

API returns 7 categories including Music Theory (curl + json assertion). CSS contains music-theory badge rules (grep). Frontend build succeeds with no errors (npm run build, 770ms).

## Verification Evidence

| # | Command | Exit Code | Verdict | Duration |
|---|---------|-----------|---------|----------|
| 1 | `curl -s http://ub01:8096/api/v1/topics | python3 assert 7 categories` | 0 | ✅ pass | 500ms |
| 2 | `grep -q music-theory frontend/src/App.css` | 0 | ✅ pass | 100ms |
| 3 | `cd frontend && npm run build` | 0 | ✅ pass | 3700ms |


## Deviations

None.

## Known Issues

None.

## Files Created/Modified

- `config/canonical_tags.yaml`
- `frontend/src/App.css`


## Deviations
None.

## Known Issues
None.
