public DefaultRiffService(AAudioRepository ar, 
                           ARiffRepository rr,
                           ACommentRepository cr,
                           ARatingRepository rar)
 {
     _ar = ar;
     _rr = rr;
     _cr = cr;
     _rar = rar;
 }
        public TestRiffService(AAudioRepository ar, 
                               ARiffRepository rr,
                               ACommentRepository cr,
                               ARatingRepository rar)
        {
            _ar = ar;
            _rr = rr;
            _cr = cr;
            _rar = rar;

            SeedRiffs();
        }