Generation of Music Using Pure JS and HTML5(cssdeck.com)

		var data = [],
			sampleRateHz = 44100,
			lengthInSeconds = 8,
			sampleCount = sampleRateHz * lengthInSeconds,

			//Notes sequence, play with it ;)
			notes = [87, 0, 87, 0, 85, 0, 82, 0, 80, 0, 82, 82, 80, 0, 82, 0, 85, 0, 78, 0, 78, 78],
			
			noteLength = sampleCount / notes.length,
			
			//Base Frequency based on the notes
			baseFreq = function(index) {
				var r = 2 * Math.PI * 220.0 * Math.pow(2,(notes[index]-69)/12.0) / sampleRateHz;
				return r;
			},
			
			envelope = function(offset, attack, decay, sustain, release) {
				if (offset <= attack) {
					return offset / attack
				} 
				offset -= attack;
				if (offset <= decay) {
					var prop = offset / decay;
					return 1 + prop * (sustain - 1);
				}
				offset -= decay;
				var susLen = 1 - (attack + decay + release);
				if (offset <= susLen) {
					return sustain;
				}
				offset -= susLen;
				return sustain * (1 - offset / release);
			};
	
	
	
	//Fill up the sound data!!
	for(var j = 0; j < sampleCount; j++) {
		var currNote = Math.round(j/noteLength);
		var currFreq = baseFreq(currNote);
		var sample = currFreq * j + 0.5 * Math.sin(currFreq * j * 1.21);
		var offset = (j % noteLength) / noteLength;
		var amp = envelope(offset, 0.05, 0.01, 0.5, 0.75);
		data[j] = 128 + Math.round(96 * amp * Math.sin(sample));
	}