{
  "schema": 1,
  "purpose": "Describe the post-score audio tail using an independently selected score alignment; not a hidden-message extraction.",
  "inputs": {
    "audio": "solution\\video\\i-am-the-method-kQx2G3x7_WQ\\analysis\\audio-48khz-mono.wav",
    "audio_sha256": "bbb2d00633a0c9278b2f0b4de12c9eeffaf8d1aadd4ccc5425d3bedcb0f572fc",
    "midi": "solution\\video\\i-am-the-method-kQx2G3x7_WQ\\reference-score\\mutopia-contrapunctusI.mid",
    "midi_sha256": "9d051a6938b09571846983281c2c7e14a447659e8bf0c74724ce6e07c4070528",
    "timing_audit": "solution\\video\\i-am-the-method-kQx2G3x7_WQ\\timing-audit\\timing-audit.json",
    "timing_audit_sha256": "1f213bd4d3435a9df765e79a29bbdbaba978bc46bb5e8fa5e90b8b45482eac38"
  },
  "cadence": {
    "alignment_rate_score_seconds_per_video_second": 1.139999999999996,
    "alignment_offset_seconds": 0.0,
    "score_end_seconds": 156.0,
    "mapped_score_end_video_seconds": 136.84210526315837,
    "final_silence_start_video_seconds": 143.08929166666667,
    "post_score_tail_seconds": 6.2471864035082945,
    "terminal_midi_notes": [
      {
        "midi_note": 50,
        "pitch_class": 2,
        "name": "D"
      },
      {
        "midi_note": 57,
        "pitch_class": 9,
        "name": "A"
      },
      {
        "midi_note": 66,
        "pitch_class": 6,
        "name": "F#"
      },
      {
        "midi_note": 74,
        "pitch_class": 2,
        "name": "D"
      }
    ],
    "terminal_triad_label": "D major (D\u2013F#\u2013A)",
    "terminal_pitch_classes": [
      2,
      6,
      9
    ],
    "steady_tail_start_video_seconds": 139.08929166666667,
    "steady_tail_profile_cosine_median": 0.9940594827128635,
    "steady_tail_profile_cosine_p05": 0.9889894974296278,
    "steady_tail_top_spectral_peaks": [
      {
        "frequency_hz": 292.96875,
        "power": 0.006266595312015173,
        "midi_note": 62,
        "note": "D4",
        "pitch_class": 2,
        "pitch_class_name": "D",
        "relative_power": 1.0
      },
      {
        "frequency_hz": 183.10546875,
        "power": 0.0060912582492258695,
        "midi_note": 54,
        "note": "F#3",
        "pitch_class": 6,
        "pitch_class_name": "F#",
        "relative_power": 0.9720203628829959
      },
      {
        "frequency_hz": 73.2421875,
        "power": 0.005941813970729903,
        "midi_note": 38,
        "note": "D2",
        "pitch_class": 2,
        "pitch_class_name": "D",
        "relative_power": 0.948172600093937
      },
      {
        "frequency_hz": 109.86328125,
        "power": 0.005631985903423302,
        "midi_note": 45,
        "note": "A2",
        "pitch_class": 9,
        "pitch_class_name": "A",
        "relative_power": 0.8987313880991946
      },
      {
        "frequency_hz": 366.2109375,
        "power": 0.0017510306944709662,
        "midi_note": 66,
        "note": "F#4",
        "pitch_class": 6,
        "pitch_class_name": "F#",
        "relative_power": 0.2794229732872092
      },
      {
        "frequency_hz": 146.484375,
        "power": 0.0016999433030346089,
        "midi_note": 50,
        "note": "D3",
        "pitch_class": 2,
        "pitch_class_name": "D",
        "relative_power": 0.27127063714729516
      },
      {
        "frequency_hz": 585.9375,
        "power": 0.0011258441470870478,
        "midi_note": 74,
        "note": "D5",
        "pitch_class": 2,
        "pitch_class_name": "D",
        "relative_power": 0.1796580265728067
      },
      {
        "frequency_hz": 439.453125,
        "power": 0.0008535574685610328,
        "midi_note": 69,
        "note": "A4",
        "pitch_class": 9,
        "pitch_class_name": "A",
        "relative_power": 0.13620752993646737
      }
    ],
    "top_eight_terminal_triad_peak_count": 8
  },
  "method": {
    "alignment": "Inherited unchanged from timing-audit.json partial_chroma_alignment.best; no tail value contributes to fit.",
    "spectrum": "4096-sample magnitude STFT, 3584-sample overlap, 55\u20134000 Hz; final-tail local PSD peaks use 32768-sample Welch windows.",
    "stationarity": "Cosine similarity of each final-tail magnitude-spectrum frame to the energy-weighted average profile of the final four seconds before literal zero PCM."
  },
  "derived": {
    "plot": "final-cadence-audit.png"
  },
  "interpretation": "The unrefit post-score tail has a stable magnitude spectrum whose eight strongest narrowband peaks are all D/F#/A, the reference terminal triad, supporting a sustained final cadence rather than an additional changing melodic payload.",
  "limits": [
    "Pitch-class summaries do not separate physical sound sources.",
    "This does not test arbitrary keyed transforms, watermarking, or unavailable pre-YouTube audio.",
    "It only bounds the apparent extra audible tail as a separate note-sequence hypothesis."
  ]
}