main.php

$player = $ev->getPlayer();
$pk = new \pocketmine\network\mcpe\protocol\PlaySoundPacket();
$pk->soundName = "music.mymusic"; // mymusic.ogg の場合
$pk->x =  $player->x;
$pk->y = $player->y;
$pk->z = $player->z;
$pk->volume = 0.5;
$pk->pitch = 1.0;
$player->dataPacket($pk);
$player->sendMessage("Send");