{
  "status": "success",
  "overall": 6.03,
  "grade": "C",
  "needs_review": false,
  "showcase_candidate": false,
  "flags": [],
  "dimensions": {
    "production": {
      "score": 0.5,
      "issues": [
        "LUFS too low (-99.0), target range -14 to -8",
        "Frequency balance far from pop reference (avg deviation 33%)",
        "Crest factor too low (0.0dB), mix sounds crushed",
        "Peak at 0.0 dBFS, likely clipping",
        "Stereo width very narrow (0.0%)",
        "High frequency presence low (0.0%), mix may sound dull"
      ],
      "metrics": {
        "lufs": -99,
        "crest": 0,
        "peak": 0,
        "width": 0,
        "low_pct": 0,
        "mid_pct": 0,
        "high_pct": 0,
        "genre": "pop",
        "freq_deviation": 33.3
      }
    },
    "lyrics_fit": {
      "score": 8.5,
      "issues": [
        "Lyrics too dense (15.6 chars/sec), may not fit timing"
      ],
      "density": 15.55,
      "rhyme_ratio": 0.416,
      "repetition_ratio": 0.188,
      "line_count": 69,
      "has_verse": true,
      "has_chorus": true
    },
    "originality": {
      "score": 9.99,
      "similarity_pct": 0.1,
      "issues": []
    },
    "melody_proxy": {
      "score": 7.51,
      "factors": {
        "key_confidence": 0.8585,
        "beat_regularity": 0.8773,
        "bpm_confidence": 1.0,
        "chromagram_focus": 0.0049
      },
      "issues": [
        "Chromagram very spread, weak tonal focus"
      ]
    },
    "vocal_presence": {
      "score": 7.0,
      "mid_pct": 33.7,
      "centroid": 413.4,
      "issues": [
        "Mid-range energy moderate (33.7%), vocals may not stand out",
        "Spectral centroid very low (413Hz), very bass-heavy"
      ]
    }
  },
  "elapsed_s": 0.005
}