?value: root      
    root: (pc | dur_change | oct_change | WS | chord | cycle | randompitch | range | list | subdivision)*
    list: "(" root ")"
    randompitch: /[\(][-?0-9][,][-?0-9][\)]/
    range: /[-?0-9]\.\.[-?0-9]/
    cycle: "<" root ">"
    pc: prefix* pitch
    pitch: /[-?0-9TE]/
    prefix: octave | duration
    oct_change: octave WS
    octave: /[_^]+/
    chord: pc pc+
    dur_change: duration WS
    duration: dur+
    dur: dchar dot*
    dchar: /[mklpdcwyhnqaefsxtgujzo]/
    dot: "."
    subitems: (pc | WS | chord | cycle | subdivision)*
    subdivision: "[" subitems "]"

    %import common.SIGNED_NUMBER
    %import common.WS