Fatal error: Call to undefined method CI_DB_mysql_driver::result()

[eluser]ferno[/eluser]
hi guys, i'm getting the error:

Fatal error: Call to undefined method CI_DB_mysql_driver::result() in /var/www/system/application/models/song_model.php on line 25

when I try to run a simple little function in one of my model classes that returns a random row

Code:

function get_random_entry()
{
    // SELECT column FROM table ORDER BY RAND() LIMIT 1            
    $query = $this->db->select('artist,title,location')->from('songs')->orderby(RAND())->limit(1);
    foreach ($query->result() as $row) // <- LINE 25
    {
        echo $row->artist;
        echo $row->title;
        echo $row->location;
    }
}

any ideas??