The turn-of-the-century Danish composer Carl Nielsen is not a household word, except perhaps in Denmark. From these performances, it's easy to understand why. Herbert Blomstedt and his San Franciscans are dutiful but strictly dullsville. Too bad, because in the right hands, Nielsen is kind of kinky -- full of harmonic twists and melodic turns. Imagine symphonic music written by a Martian and you'll have some idea of the possibilities. But you won't find them here.