As a music enthusiast, it disturbes me to see less and less opening credits with theme songs.  It used to be that the theme songs were what really set each show apart.  Even theme songs without lyrics helped to define the show.  None of the new shows I've seen so far have even a semblance of theme.  In fact, most of them have gotten rid of the opening credits entirely.  Sadly, quite a few returning shows (ER, Grey's Anatomy) have started to follow this model.  Granted, shows have incorporated great music, but those do not identify them.