export default [
  {
    id: 'rock-mixo-vamp',
    name: 'Mixolydian vamp (I–♭VII–IV)',
    rn: ['I', '♭VII', 'IV'],
    degrees: [0, 10, 5],
    qualities: ['maj', 'maj', 'maj'],
    bars: [2, 1, 1],
    mode: 'mixolydian',
    songs: ['Sweet Home Alabama — Lynyrd Skynyrd', 'Sympathy for the Devil — Rolling Stones'],
    tip: 'The ♭VII is the rock sound — borrowed flat-seven instead of the polite V. (Sweet Home Alabama famously also parses as V–IV–I; the band played it I-centred.)',
  },
  {
    id: 'rock-145',
    name: 'I–IV–V',
    rn: ['I', 'IV', 'V'],
    degrees: [0, 5, 7],
    qualities: ['maj', 'maj', 'maj'],
    bars: [2, 1, 1],
    mode: 'major',
    songs: ['Wild Thing — The Troggs', 'Twist and Shout — The Beatles', 'La Bamba'],
    tip: 'Three chords, no slack: the arrangement does the work. Decide per section how big each hit is — that decision is the song.',
  },
  {
    id: 'rock-minor-descent',
    name: 'Minor descent (i–♭VII–♭VI–V)',
    rn: ['i', '♭VII', '♭VI', 'V'],
    degrees: [0, 10, 8, 7],
    qualities: ['min', 'maj', 'maj', 'maj'],
    bars: [1, 1, 1, 1],
    mode: 'minor',
    songs: ['Hit the Road Jack — Ray Charles', 'Sultans of Swing — Dire Straits (chorus tail)', 'All Along the Watchtower (without the V)'],
    tip: 'A staircase to the V: the major V is borrowed from harmonic minor and is what yanks the loop home. Drop it and you get the floatier Watchtower version.',
  },
  {
    id: 'rock-axis',
    name: 'Axis (I–V–vi–IV)',
    rn: ['I', 'V', 'vi', 'IV'],
    degrees: [0, 7, 9, 5],
    qualities: ['maj', 'maj', 'min', 'maj'],
    bars: [1, 1, 1, 1],
    mode: 'major',
    songs: ['With or Without You — U2', 'Let It Be — The Beatles'],
    tip: 'The same four chords carry a whisper or a stadium — rock\'s job is choosing which. Start the loop on the vi for the dark version.',
  },
  {
    id: 'rock-riff-cell',
    name: 'Riff cell (i–♭III–IV)',
    rn: ['i', '♭III', 'IV'],
    degrees: [0, 3, 5],
    qualities: ['min', 'maj', 'maj'],
    bars: [2, 1, 1],
    mode: 'dorian',
    songs: ['Smoke on the Water — Deep Purple', 'Iron Man — Black Sabbath (spine of the riff)'],
    tip: 'Root–♭3–4 is THE rock riff cell, lifted straight from minor pentatonic. The major IV makes it Dorian — the app\'s Dorian mode lights up exactly these notes.',
  },
]
