ff8c00/Intermediate.html

## Intermediate.html
<html>
<head>
<script>
var mozart = [
  [ 96,  32,  69,  40, 148, 104, 152, 119,  98,   3,  54],
  [ 22,   6,  95,  17,  74, 157,  60,  84, 142,  87, 130],
  [141, 128, 158, 113, 163,  27, 171, 114,  42, 165,  10],
  [ 41,  63,  13,  85,  45, 167,  53,  50, 156,  61, 103],
  [105, 146, 153, 161,  80, 154,  99, 140,  75, 135,  28],
  [122,  46,  55,   2,  97,  68, 133,  86, 129,  47,  37],
  [ 11, 134, 110, 159,  36, 118,  21, 169,  62, 147, 106],
  [ 30,  81,  24, 100, 107,  91, 127,  94, 123,  33,   5],
  [ 70, 117,  66,  90,  25, 138,  16, 120,  65, 102,  35],
  [121,  39, 136, 176, 143,  71, 155,  88,  77,   4,  20],
  [ 26, 126,  15,   7,  64, 150,  57,  48,  19,  31, 108],
  [  9,  56, 132,  34, 125,  29, 175, 166,  82, 164,  92],
  [112, 174,  73,  67,  76, 101,  43,  51, 137, 144,  12],
  [ 49,  18,  58, 160, 136, 162, 168, 115,  38,  59, 124],
  [109, 116, 145,  52,   1,  23,  89,  72, 149, 173,  44],
  [ 14,  83,  79, 170,  93, 151, 172, 111,   8,  78, 131]
];

function open(uri, callback) {
  var xhttp;

  xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      callback(this.responseText);
    }
  };
  xhttp.open("GET", uri, true);
  xhttp.send();
}

function parse(file) {
  var measures, i, items, item, measure, j;

  measures = [];
  for (i = 0; i < 176; i++) {
    measures[i] = [];
  }
  items = file.split("\r\n");
  for (i = 0; i < items.length; i++) {
    item = items[i].split(" ");
    measure = {
      note: item[0],
      start: parseFloat(item[1]),
      duration: parseFloat(item[2])
    };
    j = Math.floor(measure.start / 3);
    measure.start = measure.start - (j * 3);
    measures[j].push(measure);
  }
  return measures;
}

function random(measures) {
  var composition, i, j, items, k, item, measure;

  composition = [];
  for (i = 0; i < 16; i++) {
    j = Math.floor(Math.random() * 6) + Math.floor(Math.random() * 6);
    items = measures[mozart[i][j] - 1];
    for (k = 0; k < items.length; k++) {
      item = items[k];
      measure = {
        note: item.note,
        start: item.start + (i * 3),
        duration: item.duration
      };
      composition.push(measure);
    }
  }
  return composition;
}

function print (composition) {
  var i, measure;

  for (i = 0; i < composition.length; i++) {
    measure = composition[i];
    document.write(measure.note + " ");
    document.write(measure.start + " ");
    document.write(measure.duration + " ");
    document.write("<br>");
  }
}

function convert(note) {
  var notes, i;

  notes = [
    "C", "", "D", "", "E", "F", "", "G", "", "A", "", "B"
  ];
  i = notes.indexOf(note[0]);
  if (note.length == 2) {
    i = i + ((1 + parseInt(note[1])) * 12);
  } else {
    i = i + ((1 + parseInt(note[2])) * 12) + 1;
  }
  return Math.pow(2, (i - 69) / 12) * 440;
}

function music (composition) {
  var audio, volume, sound, index, i, measure, frequency, start, duration;
  var tempo = 60 / 120, fade = 0.25 * tempo;

  audio = new AudioContext();
  volume = [];
  sound = [];
  for (i = 0; i < 12; i++) {
    volume[i] = audio.createGain();
    volume[i].gain.setValueAtTime(0, audio.currentTime);
    volume[i].connect(audio.destination);
    sound[i] = audio.createOscillator();
    sound[i].type = "sawtooth";
    sound[i].connect(volume[i]);
    sound[i].start();
  }
  index = 0;
  for (i = 0; i < composition.length; i++) {
    measure = composition[i];
    frequency = convert(measure.note);
    start = measure.start * tempo;
    duration = measure.duration * tempo;
    volume[index].gain.setValueAtTime(0.5, start);
    volume[index].gain.setTargetAtTime(0, start + duration - fade, fade);
    sound[index].frequency.setValueAtTime(frequency, start);
    index = index + 1;
    if (index == sound.length) {
      index = 0;
    }
  }
}

function run() {
  open("mozart.txt", function(file) {
    var measures, composition;

    measures = parse(file);
    composition = random(measures);
    print(composition);
    music(composition);
  });
}
</script>
</head>
<body onload="run()">
</body>
</html>
	<html>
	<head>
	<script>
	var mozart = [
	[ 96, 32, 69, 40, 148, 104, 152, 119, 98, 3, 54],
	[ 22, 6, 95, 17, 74, 157, 60, 84, 142, 87, 130],
	[141, 128, 158, 113, 163, 27, 171, 114, 42, 165, 10],
	[ 41, 63, 13, 85, 45, 167, 53, 50, 156, 61, 103],
	[105, 146, 153, 161, 80, 154, 99, 140, 75, 135, 28],
	[122, 46, 55, 2, 97, 68, 133, 86, 129, 47, 37],
	[ 11, 134, 110, 159, 36, 118, 21, 169, 62, 147, 106],
	[ 30, 81, 24, 100, 107, 91, 127, 94, 123, 33, 5],
	[ 70, 117, 66, 90, 25, 138, 16, 120, 65, 102, 35],
	[121, 39, 136, 176, 143, 71, 155, 88, 77, 4, 20],
	[ 26, 126, 15, 7, 64, 150, 57, 48, 19, 31, 108],
	[ 9, 56, 132, 34, 125, 29, 175, 166, 82, 164, 92],
	[112, 174, 73, 67, 76, 101, 43, 51, 137, 144, 12],
	[ 49, 18, 58, 160, 136, 162, 168, 115, 38, 59, 124],
	[109, 116, 145, 52, 1, 23, 89, 72, 149, 173, 44],
	[ 14, 83, 79, 170, 93, 151, 172, 111, 8, 78, 131]
	];

	function open(uri, callback) {
	var xhttp;

	xhttp = new XMLHttpRequest();
	xhttp.onreadystatechange = function() {
	if (this.readyState == 4 && this.status == 200) {
	callback(this.responseText);
	}
	};
	xhttp.open("GET", uri, true);
	xhttp.send();
	}

	function parse(file) {
	var measures, i, items, item, measure, j;

	measures = [];
	for (i = 0; i < 176; i++) {
	measures[i] = [];
	}
	items = file.split("\r\n");
	for (i = 0; i < items.length; i++) {
	item = items[i].split(" ");
	measure = {
	note: item[0],
	start: parseFloat(item[1]),
	duration: parseFloat(item[2])
	};
	j = Math.floor(measure.start / 3);
	measure.start = measure.start - (j * 3);
	measures[j].push(measure);
	}
	return measures;
	}

	function random(measures) {
	var composition, i, j, items, k, item, measure;

	composition = [];
	for (i = 0; i < 16; i++) {
	j = Math.floor(Math.random() * 6) + Math.floor(Math.random() * 6);
	items = measures[mozart[i][j] - 1];
	for (k = 0; k < items.length; k++) {
	item = items[k];
	measure = {
	note: item.note,
	start: item.start + (i * 3),
	duration: item.duration
	};
	composition.push(measure);
	}
	}
	return composition;
	}

	function print (composition) {
	var i, measure;

	for (i = 0; i < composition.length; i++) {
	measure = composition[i];
	document.write(measure.note + " ");
	document.write(measure.start + " ");
	document.write(measure.duration + " ");
	document.write("<br>");
	}
	}

	function convert(note) {
	var notes, i;

	notes = [
	"C", "", "D", "", "E", "F", "", "G", "", "A", "", "B"
	];
	i = notes.indexOf(note[0]);
	if (note.length == 2) {
	i = i + ((1 + parseInt(note[1])) * 12);
	} else {
	i = i + ((1 + parseInt(note[2])) * 12) + 1;
	}
	return Math.pow(2, (i - 69) / 12) * 440;
	}

	function music (composition) {
	var audio, volume, sound, index, i, measure, frequency, start, duration;
	var tempo = 60 / 120, fade = 0.25 * tempo;

	audio = new AudioContext();
	volume = [];
	sound = [];
	for (i = 0; i < 12; i++) {
	volume[i] = audio.createGain();
	volume[i].gain.setValueAtTime(0, audio.currentTime);
	volume[i].connect(audio.destination);
	sound[i] = audio.createOscillator();
	sound[i].type = "sawtooth";
	sound[i].connect(volume[i]);
	sound[i].start();
	}
	index = 0;
	for (i = 0; i < composition.length; i++) {
	measure = composition[i];
	frequency = convert(measure.note);
	start = measure.start * tempo;
	duration = measure.duration * tempo;
	volume[index].gain.setValueAtTime(0.5, start);
	volume[index].gain.setTargetAtTime(0, start + duration - fade, fade);
	sound[index].frequency.setValueAtTime(frequency, start);
	index = index + 1;
	if (index == sound.length) {
	index = 0;
	}
	}
	}

	function run() {
	open("mozart.txt", function(file) {
	var measures, composition;

	measures = parse(file);
	composition = random(measures);
	print(composition);
	music(composition);
	});
	}
	</script>
	</head>
	<body onload="run()">
	</body>
	</html>