piano.js

// http://www.multiplayerpiano.com/

var TEMP = 210; // bpm

function tap(note, part, next) {
  MPP.piano.play(note, 1, MPP.client.getOwnParticipant(), 0);
  setTimeout(function(){
    MPP.piano.stop(note, MPP.client.getOwnParticipant(), 0);
    next();
  }, 60e3/(TEMP*part)*4);
}

function play(melody) {
    var data = melody.split(',');
    var i = 0;
    playNote();    
    function playNote() {
      var note = data[i].split('/');
      if (!note[1]) note[1] = 16;
      console.log(note);
      tap(note[0], note[1], function(){
        if (++i < data.length) playNote();
      });
    }
}

var shmel = [];
shmel = shmel.concat(['e5', 'ds5', 'd5', 'cs5'], ['d5', 'cs5', 'c5', 'b4']);
shmel = shmel.concat(['c5', 'b4', 'as4', 'a4'], ['gs4', 'g4', 'fs4', 'f4']);
shmel = shmel.concat(['e4', 'ds4', 'd4', 'cs4'], ['d4', 'cs4', 'c4', 'b3']);
shmel = shmel.concat(['c4', 'b3', 'as3', 'a3'], ['gs3', 'g3', 'fs3', 'f3']);

shmel = shmel.concat(['e3', 'ds3', 'd3', 'cs3'], ['d3', 'cs3', 'c3', 'b2']);
shmel = shmel.concat(['e3', 'ds3', 'd3', 'cs3'], ['d3', 'cs3', 'c3', 'b2']);
shmel = shmel.concat(['e3', 'ds3', 'd3', 'cs3'], ['c3', 'f3', 'e3', 'ds3']);
shmel = shmel.concat(['e3', 'ds3', 'd3', 'cs3'], ['c3', 'cs3', 'd3', 'ds3']);

shmel = shmel.concat(['e3', 'ds3', 'd3', 'cs3'], ['c3', 'f3', 'e3', 'ds3']);
shmel = shmel.concat(['e3', 'ds3', 'd3', 'cs3'], ['c3', 'cs3', 'd3', 'ds3']);
shmel = shmel.concat(['e3', 'ds3', 'd3', 'cs3'], ['d3', 'cs3', 'c3', 'b2']);
shmel = shmel.concat(['c3', 'cs3', 'd3', 'ds3'], ['e3', 'f3', 'e3', 'ds3']);

shmel = shmel.concat(['e3', 'ds3', 'd3', 'cs3'], ['d3', 'cs3', 'c3', 'b2']);
shmel = shmel.concat(['c3', 'cs3', 'd3', 'ds3'], ['e3', 'f3', 'g3', 'gs3']);
shmel = shmel.concat(['a3', 'gs3', 'g3', 'fs3'], ['f3', 'as3', 'a3', 'gs3']);
shmel = shmel.concat(['a3', 'gs3', 'g3', 'fs3'], ['f3', 'fs3', 'g3', 'gs3']);

shmel = shmel.concat(['a3', 'gs3', 'g3', 'fs3'], ['f3', 'as3', 'a3', 'gs3']);
shmel = shmel.concat(['a3', 'gs3', 'g3', 'fs3'], ['f3', 'fs3', 'g3', 'gs3']);
shmel = shmel.concat(['a3', 'gs3', 'g3', 'fs3'], ['g3', 'fs3', 'f3', 'e3']);
shmel = shmel.concat(['f3', 'fs3', 'g3', 'gs3'], ['a3', 'as3', 'a3', 'gs3']);

shmel = shmel.concat(['a3', 'gs3', 'g3', 'fs3'], ['g3', 'fs3', 'f3', 'e3']);
shmel = shmel.concat(['f3', 'fs3', 'g3', 'gs3'], ['a3', 'as3', 'a3', 'gs3']);
shmel = shmel.concat(['a3', 'a2', 'a2', 'a2'], ['a2', 'a2', 'a2', 'a2']);
shmel = shmel.concat(['as2', 'gs2', 'as2', 'gs2'], ['as2', 'gs2', 'as2', 'gs2']);

shmel = shmel.concat(['a2', 'a2', 'a2', 'a2'], ['a2', 'a2', 'a2', 'a2']);
shmel = shmel.concat(['as2', 'gs2', 'as2', 'gs2'], ['as2', 'gs2', 'as2', 'gs2']);
shmel = shmel.concat(['a2', 'as2', 'a2', 'gs2'], ['a2', 'as2', 'a2', 'gs2']);
shmel = shmel.concat(['a2', 'as2', 'a2', 'gs2'], ['a2', 'as2', 'a2', 'gs2']);

shmel = shmel.concat(['a2', 'as2', 'b2', 'c3'], ['cs3', 'c3', 'b2', 'as2']);
shmel = shmel.concat(['a2', 'as2', 'b2', 'c3'], ['cs3', 'd3', 'ds3', 'e3']);
shmel = shmel.concat(['d3', 'd3', 'd3', 'd3'], ['d3', 'd3', 'd3', 'd3']);
shmel = shmel.concat(['ds3', 'cs3', 'ds3', 'cs3'], ['ds3', 'cs3', 'ds3', 'cs3']);

shmel = shmel.concat(['d3', 'd3', 'd3', 'd3'], ['d3', 'd3', 'd3', 'd3']);
shmel = shmel.concat(['ds3', 'cs3', 'ds3', 'cs3'], ['ds3', 'cs3', 'ds3', 'cs3']);
shmel = shmel.concat(['d3', 'ds3', 'd3', 'cs3'], ['d3', 'ds3', 'd3', 'cs3']);
shmel = shmel.concat(['d3', 'ds3', 'd3', 'cs3'], ['d3', 'ds3', 'd3', 'cs3']);

shmel = shmel.concat(['d3', 'ds3', 'e3', 'f3'], ['fs3', 'f3', 'e3', 'ds3']);
shmel = shmel.concat(['d3', 'ds3', 'e3', 'f3'], ['fs3', 'f3', 'e3', 'ds3']);
shmel = shmel.concat(['d4', 'cs4', 'c4', 'b3'], ['as3', 'ds4', 'd4', 'cs4']);
shmel = shmel.concat(['d4', 'cs4', 'c4', 'b3'], ['as3', 'b3', 'c4', 'cs4']);

shmel = shmel.concat(['d4', 'cs4', 'c4', 'b3'], ['c4', 'b3', 'as3', 'a3']);
shmel = shmel.concat(['as3', 'b3', 'c4', 'cs4'], ['c4', 'cs4', 'd4', 'ds4']);
shmel = shmel.concat(['e4', 'ds4', 'd4', 'cs4'], ['d4', 'cs4', 'c4', 'b3']);
shmel = shmel.concat(['c4', 'b3', 'as3', 'a3'], ['gs3', 'g3', 'fs3', 'f3']);

play(shmel.join(','));