How to get related objects from many to many relation order by order?

I have 3 models: Song, SongArtist, Artist.

Relation between Song and Artist is many-to-many by SongArtist table. A song has many artists sing it, and order by field 'order' in table 'SongArtist'. I want when getting a song, the related artists object will be orderd by 'order' like this:

$song = Song::findFirstById(999);
$artists = $song->artists; [which already orderd]

Is there a way that do automatically or use built in function of Model? I have a solution that solve this problem but take more steps:

$song_id = 999;

$song = Song::findFirstById($song_id);
$songArtists = $song->getsongArtists(array(
    "song_id = $song_id"
    "order" => "order asc"
));

$artists = array();

foreach($songArtists as $songArtist) {
        $artist_id = $songArtist->artist_id;
        $artist = Artist::findFirstById($artist_id);
        $artists[] = $artist;
}

return $artists;

Song:

    public $id;

    public function initialize()
    {
        $this->hasManyToMany(
            "id",
            "Bcdcnt\Models\SongArtist",
            "song_id",
            "artist_id",
            "Bcdcnt\Models\Artist",
            "id",
            array('alias' => 'artists')
        );

        $this->hasMany("id", "Bcdcnt\Models\SongArtist", "song_id", array(
            'alias' => 'songArtists',
            'foreignKey' => array(
                'action' => Relation::ACTION_CASCADE
            )
        ));
    }

SongArtist:

    public $id;
    public $song_id;
    public $artist_id;
    public $order;

Artist:

    public $id;

    $this->hasManyToMany(
            "id",
            "Bcdcnt\Models\SongArtist",
            "artist_id",
            "song_id",
            "Bcdcnt\Models\Song",
            "id",
            array('alias' => 'songs')
        );

        $this->hasMany("id", "Bcdcnt\Models\SongArtist", "artist_id", array(
            'alias' => 'songArtists',
            'foreignKey' => array(
                'action' => Relation::ACTION_CASCADE
            )
        ));