private function writeMeasures(Song $song, Tempo $tempo) { for ($i = 0; $i < $song->countMeasureHeaders(); $i++) { $header = $song->getMeasureHeader($i); for ($j = 0; $j < $song->countTracks(); $j++) { $track = $song->getTrack($j); $measure = $track->getMeasure($i); $this->writeMeasure($measure, $header->getTempo()->getValue() != $tempo->getValue()); } $tempo->copyFrom($header->getTempo()); } }