{
  "app": {
    "name": "VoiceForge Karaoke",
    "version": "1.0.0",
    "ai_features": ["pitch_correction", "style_transfer", "harmony_generation", "crowd_simulation"]
  },
  "session": {
    "id": "sess_20260225_001",
    "started_at": "2026-02-25T21:00:00Z",
    "venue_mode": "living_room",
    "crowd_energy": 0.72
  },
  "queue": [
    {
      "id": "track_001",
      "title": "Bohemian Rhapsody",
      "artist": "Queen",
      "duration_seconds": 354,
      "bpm": 72,
      "key": "Bb_major",
      "difficulty": "legendary",
      "queued_by": "alex",
      "ai_settings": {
        "pitch_assist": true,
        "pitch_assist_strength": 0.4,
        "style_transfer": null,
        "add_harmonies": true,
        "harmony_voices": 2,
        "crowd_reactions": true
      },
      "lyrics": [
        {
          "line_id": 1,
          "start_ms": 48000,
          "end_ms": 55000,
          "text": "Is this the real life?",
          "notes": ["Bb3", "Bb3", "C4", "Bb3", "G3", "F3"]
        },
        {
          "line_id": 2,
          "start_ms": 55500,
          "end_ms": 62000,
          "text": "Is this just fantasy?",
          "notes": ["Bb3", "Bb3", "C4", "Bb3", "Ab3", "G3"]
        }
      ]
    },
    {
      "id": "track_002",
      "title": "Dancing Queen",
      "artist": "ABBA",
      "duration_seconds": 231,
      "bpm": 101,
      "key": "A_major",
      "difficulty": "easy",
      "queued_by": "priya",
      "ai_settings": {
        "pitch_assist": true,
        "pitch_assist_strength": 0.2,
        "style_transfer": "disco_diva",
        "add_harmonies": true,
        "harmony_voices": 1,
        "crowd_reactions": true
      },
      "lyrics": [
        {
          "line_id": 1,
          "start_ms": 55000,
          "end_ms": 60500,
          "text": "You are the dancing queen",
          "notes": ["E4", "E4", "D4", "E4", "F#4", "A4"]
        }
      ]
    }
  ],
  "singers": [
    {
      "id": "singer_alex",
      "name": "Alex",
      "avatar_emoji": "🎤",
      "score_total": 4820,
      "songs_sung": 3,
      "best_streak": 12,
      "badges": ["pitch_perfect", "crowd_pleaser"],
      "vocal_range": {
        "lowest_note": "C3",
        "highest_note": "G4"
      }
    },
    {
      "id": "singer_priya",
      "name": "Priya",
      "avatar_emoji": "🌟",
      "score_total": 6150,
      "songs_sung": 4,
      "best_streak": 20,
      "badges": ["pitch_perfect", "showstopper", "harmony_hero"],
      "vocal_range": {
        "lowest_note": "A3",
        "highest_note": "C6"
      }
    }
  ],
  "ai_models": {
    "pitch_correction": {
      "model_id": "pitch-net-v3",
      "latency_ms": 12,
      "enabled": true
    },
    "style_transfer": {
      "model_id": "style-forge-v2",
      "latency_ms": 40,
      "enabled": true,
      "available_styles": [
        "opera_tenor",
        "disco_diva",
        "jazz_crooner",
        "punk_rawness",
        "country_twang",
        "80s_power_ballad"
      ]
    },
    "crowd_simulation": {
      "model_id": "crowd-gen-v1",
      "latency_ms": 8,
      "enabled": true,
      "reactions": ["cheer", "clap", "gasp", "sing_along", "lighter_wave"]
    }
  },
  "leaderboard": [
    { "rank": 1, "singer_id": "singer_priya", "score": 6150 },
    { "rank": 2, "singer_id": "singer_alex",  "score": 4820 }
  ]
}