The Music Center hired a new president, and she's a veteran arts administrator -- as well as something of an artist herself. Rachel Moore is a former member of the American Ballet Theatre corps de ballet and, for the last 14 years, the company's president and CEO. To judge from reaction to her appointment, L.A. arts leaders have high hopes. She's got a task ahead of her, as we've pointed out. Music critic Mark Swed, in particular, has had some strong words for the organization.