code: function str (pitch) {
    var p = Array.isArray(pitch) ? pitch : asPitch.parse(pitch)
    return p ? asPitch.stringify(p) : null
  }
docs: Get pitch name in scientific notation
  
  @param {String|Array} pitch - the pitch string or array
  @return {String} the name of the pitch
  
  @example
  pitch.str('cb') // => 'Cb'
  pitch.str('fx2') // => 'F##2'