I’ve been researching “Cinderella,” Frederick Ashton’s fairy tale ballet for adults choreographed for Sadlers Wells Ballet (precursor to the Royal Ballet) based on Prokofiev’s score. The Joffrey Ballet is bringing its production of this gem to Los Angeles at the end of January. “Cinderella” was the first full-evening ballet Ashton, or any British-born dance maker, created. He made the work ...