public function __clone()
{
$beat = new Beat();
$beat->setStart($this->getStart());
$beat->getStroke()->copyFrom($this->getStroke());
for ($i = 0; $i < count($this->voices); $i++) {
$beat->setVoice($i, clone $this->voices[$i]);
}
if ($this->chord != null) {
$beat->setChord(clone $this->chord);
}
if ($this->text != null) {
$beat->setText(clone $this->text);
}
return $beat;
}
