export default [
  {
    id: 'blues-12bar',
    name: 'Standard 12-bar',
    rn: ['I7', 'I7', 'I7', 'I7', 'IV7', 'IV7', 'I7', 'I7', 'V7', 'IV7', 'I7', 'V7'],
    degrees: [0, 0, 0, 0, 5, 5, 0, 0, 7, 5, 0, 7],
    qualities: ['dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7'],
    bars: [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
    mode: 'major',
    songs: ['Sweet Home Chicago', 'Pride and Joy — Stevie Ray Vaughan', 'Johnny B. Goode — Chuck Berry'],
    tip: 'Bar 12 is the V7 launching the next chorus — never let it resolve flat. The form is a wheel, and bar 12 is where you push it.',
  },
  {
    id: 'blues-quickchange',
    name: 'Quick-change 12-bar',
    rn: ['I7', 'IV7', 'I7', 'I7', 'IV7', 'IV7', 'I7', 'I7', 'V7', 'IV7', 'I7', 'V7'],
    degrees: [0, 5, 0, 0, 5, 5, 0, 0, 7, 5, 0, 7],
    qualities: ['dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7'],
    bars: [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
    mode: 'major',
    songs: ['Dust My Broom — Elmore James', 'Hide Away — Freddie King', 'Crossroads — Cream'],
    tip: 'One bar of IV in bar 2, then home. Listen for it in the first seconds of a jam — guessing wrong here is the most common train wreck in blues.',
  },
  {
    id: 'blues-8bar',
    name: '8-bar blues',
    rn: ['I7', 'V7', 'IV7', 'IV7', 'I7', 'V7', 'I7', 'V7'],
    degrees: [0, 7, 5, 5, 0, 7, 0, 7],
    qualities: ['dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7', 'dom7'],
    bars: [1, 1, 1, 1, 1, 1, 1, 1],
    mode: 'major',
    songs: ['Key to the Highway — Big Bill Broonzy', 'It Hurts Me Too — Elmore James'],
    tip: 'The V arrives in bar 2 — much sooner than a 12-bar. Count the form out loud the first chorus; 8-bar tunes wrong-foot 12-bar reflexes.',
  },
  {
    id: 'blues-minor',
    name: 'Minor blues',
    rn: ['i7', 'i7', 'i7', 'i7', 'iv7', 'iv7', 'i7', 'i7', '♭VI7', 'V7', 'i7', 'i7'],
    degrees: [0, 0, 0, 0, 5, 5, 0, 0, 8, 7, 0, 0],
    qualities: ['min7', 'min7', 'min7', 'min7', 'min7', 'min7', 'min7', 'min7', 'dom7', 'dom7', 'min7', 'min7'],
    bars: [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
    mode: 'minor',
    songs: ['The Thrill Is Gone — B.B. King', 'As the Years Go Passing By — Albert King'],
    tip: 'Bars 9–10 are the whole drama: ♭VI sliding down a half-step to V7. (B.B.\'s recording makes the ♭VI a maj7 — try both colours.)',
  },
  {
    id: 'blues-turnaround',
    name: 'Turnaround cycle (I–VI–ii–V)',
    rn: ['I7', 'VI7', 'ii7', 'V7'],
    degrees: [0, 9, 2, 7],
    qualities: ['dom7', 'dom7', 'min7', 'dom7'],
    bars: [1, 1, 1, 1],
    mode: 'major',
    songs: ['Call It Stormy Monday — T-Bone Walker (intro)', 'jazz-blues bars 11–12 everywhere'],
    tip: 'The jazz handshake inside the blues — often squeezed into two bars (two beats per chord). Loop it as a vamp and you\'ve learned bars 11–12 of every uptown blues.',
  },
]
