{
  "status": "success",
  "overall": 7.67,
  "grade": "A",
  "needs_review": false,
  "showcase_candidate": false,
  "flags": [],
  "dimensions": {
    "production": {
      "score": 6.0,
      "issues": [
        "Frequency balance far from classical reference (avg deviation 35%)",
        "Peak at 0.2 dBFS, likely clipping",
        "High frequency presence low (0.7%), mix may sound dull"
      ],
      "metrics": {
        "lufs": -10.6,
        "crest": 13.300000190734863,
        "peak": 0.20000000298023224,
        "width": 16.399999618530273,
        "low_pct": 73.19999694824219,
        "mid_pct": 26.100000381469727,
        "high_pct": 0.699999988079071,
        "genre": "classical",
        "freq_deviation": 34.8
      }
    },
    "lyrics_fit": {
      "score": 8.5,
      "issues": [
        "Lyrics too dense (14.7 chars/sec), may not fit timing"
      ],
      "density": 14.69,
      "rhyme_ratio": 0.516,
      "repetition_ratio": 0.177,
      "line_count": 62,
      "has_verse": true,
      "has_chorus": true
    },
    "originality": {
      "score": 9.21,
      "similarity_pct": 7.9,
      "issues": []
    },
    "melody_proxy": {
      "score": 7.48,
      "factors": {
        "key_confidence": 0.882,
        "beat_regularity": 0.7873,
        "bpm_confidence": 0.9591,
        "chromagram_focus": 0.007
      },
      "issues": [
        "Chromagram very spread, weak tonal focus"
      ]
    },
    "vocal_presence": {
      "score": 7.0,
      "mid_pct": 26.1,
      "centroid": 310.0,
      "issues": [
        "Mid-range energy moderate (26.1%), vocals may not stand out",
        "Spectral centroid very low (310Hz), very bass-heavy"
      ]
    },
    "aesthetic": {
      "score": 8.23,
      "sub_scores": {
        "musicality": 8.0,
        "vocal_quality": 8.0,
        "arrangement": 8.5,
        "emotional_impact": 8.5
      },
      "summary": "This is a beautifully melancholic pop ballad with a strong emotional core, driven by a natural-sounding vocal performance and a well-arranged piano accompaniment.",
      "issues": [],
      "model": "gemini-2.5-flash"
    }
  },
  "elapsed_s": 0.005
}