This week's From the Top comes from New England Conservatory's Jordan Hall in Boston, where 18-year-old Samuel Thomas unpacks his accordion to play 'Chopin's Nightmare.' Eleven-year-old violinist Mindy Chen plays a romance by Sarasate, and a talented teen quintet takes on Dvorak. Also, a young cellist chooses Elgar, and a 14-year-old pianist plays Prokofiev. » E-Mail This » Add to Del.icio.us