{
  "_comment": "Sampling-classics demo sources for the Foundry — fuel for demo, precompute, and loop/chop-quality iteration (#19 autotune). 'source' is whatever yt-dlp accepts: a verified watch URL where we're certain of the id, else an `ytsearch1:` query that resolves to the top hit at fetch time (so we never ship a guessed/broken video id). Each entry notes drums-presence because the finder's grid-from-drums path depends on it (no-drums sources fall back to bass/first stem — see project_foundry recall notes).",
  "demos": [
    {
      "slug": "loituma",
      "title": "Loituma — Ievan Polkka",
      "year": 1995,
      "source": "https://www.youtube.com/watch?v=hqthspSKZV8",
      "verified": true,
      "why": "The 'Leekspin' meme source; rapid Finnish a-cappella-ish vocal over accordion.",
      "expect": "No drums. Voice + accordion. Tests VOCAL chop mode + no-drums grid fallback.",
      "tags": ["vocal", "no-drums", "chops", "fast"]
    },
    {
      "slug": "rickroll",
      "title": "Rick Astley — Never Gonna Give You Up",
      "year": 1987,
      "source": "https://www.youtube.com/watch?v=dQw4w9WgXcQ",
      "verified": true,
      "why": "The universal demo track; clean, well-produced 80s pop.",
      "expect": "Full 4-stem mix (drums/bass/vocals/synth). Tests clean separation + bar-aligned loops on a famous reference.",
      "tags": ["full-mix", "pop", "loops", "4-stem"]
    },
    {
      "slug": "amen-break",
      "title": "The Winstons — Amen, Brother",
      "year": 1969,
      "source": "ytsearch1:The Winstons Amen Brother original",
      "verified": false,
      "why": "THE Amen break — the most-sampled drum break in history (jungle/DnB/hip-hop).",
      "expect": "Drum break ~7s in. The gold standard for drum loop/chop detection — if the finder can't nail this, the rubric is wrong.",
      "tags": ["break", "drums", "loops", "chops", "ground-truth"]
    },
    {
      "slug": "funky-drummer",
      "title": "James Brown — Funky Drummer",
      "year": 1970,
      "source": "ytsearch1:James Brown Funky Drummer full",
      "verified": false,
      "why": "Clyde Stubblefield's break — among the most-sampled grooves ever.",
      "expect": "Funk band; isolated drum break mid-track. Tests groove-loop detection + drums grid on a live-feel tempo.",
      "tags": ["break", "drums", "funk", "loops"]
    },
    {
      "slug": "think-break",
      "title": "Lyn Collins — Think (About It)",
      "year": 1972,
      "source": "ytsearch1:Lyn Collins Think About It",
      "verified": false,
      "why": "The 'Think' break + the ubiquitous 'woo!/yeah!' vocal stabs (It Takes Two, etc.).",
      "expect": "Both a drum break AND short vocal one-shots. Tests drum loops + vocal CHOP/one-shot detection in one source.",
      "tags": ["break", "drums", "vocal", "chops", "one-shots"]
    },
    {
      "slug": "grandmaster-flash-wheels",
      "title": "Grandmaster Flash — The Adventures of Grandmaster Flash on the Wheels of Steel",
      "year": 1981,
      "source": "ytsearch1:Grandmaster Flash Adventures on the Wheels of Steel",
      "verified": false,
      "why": "Pioneering turntablist collage — many sources cut/scratched together.",
      "expect": "Messy multi-source montage. Stress-tests separation + finder on non-stationary, collaged material.",
      "tags": ["collage", "turntablism", "hard", "loops"]
    },
    {
      "slug": "mozart-sym40",
      "title": "Mozart — Symphony No. 40 in G minor, K.550 (1st mvt)",
      "year": 1788,
      "source": "ytsearch1:Mozart Symphony No 40 G minor first movement",
      "verified": false,
      "why": "A clean classical reference — the 'sampled Mozart' archetype for melodic material.",
      "expect": "NO drums, NO bass-as-808; all 'other' (strings/winds). Tests separation on orchestral + phrase-length loops with no rhythmic grid.",
      "tags": ["classical", "no-drums", "melodic", "loops", "edge-case"]
    },
    {
      "slug": "humpty-dance",
      "title": "Digital Underground — The Humpty Dance",
      "year": 1990,
      "source": "ytsearch1:Digital Underground The Humpty Dance",
      "verified": false,
      "why": "Hip-hop classic built FROM samples (Parliament/Sly) and itself widely sampled.",
      "expect": "Strong drums + bass + vocal. Tests bass/drum loop extraction; pairs with the existing 'humpty' GT in the sample corpus.",
      "tags": ["hip-hop", "drums", "bass", "vocal", "loops"]
    },
    {
      "slug": "good-times",
      "title": "Chic — Good Times",
      "year": 1979,
      "source": "ytsearch1:Chic Good Times 1979",
      "verified": false,
      "why": "Bernard Edwards' bassline — the foundation of Rapper's Delight and countless others.",
      "expect": "Iconic disco bassline + tight drums. Tests BASS loop extraction quality specifically.",
      "tags": ["disco", "bass", "drums", "loops", "groove"]
    },
    {
      "slug": "apache",
      "title": "Incredible Bongo Band — Apache",
      "year": 1973,
      "source": "ytsearch1:Incredible Bongo Band Apache",
      "verified": false,
      "why": "'The national anthem of hip-hop' — the Apache break (bongos + drums).",
      "expect": "Percussion-rich break. Tests percussion/break loop detection + onset chop mode on busy drums.",
      "tags": ["break", "drums", "percussion", "loops", "chops"]
    }
  ]
}
