@Mod.EventBusSubscriber(Dist.CLIENT)
public class PlaySoundClass {
    private final ClientPlayerEntity player;

    public PlaySoundClass(ClientPlayerEntity player) {
        this.player = player;
    }
@SubscribeEvent
    public void tick() {
        if (player.getHeldItemMainhand().getItem() == ItemList.blue_lightsaber) {
            this.player.playSound(SoundEvents.AMBIENT_CAVE, 1.0F, 1.0F);
        }
    }
}