HERE'S one story from the vaults, not so well known. Amartya Sen hated his music classes, a rite of passage in Shantiniketan, where he grew up and went to school. For purists at Rabindranath Tagore's leafy abode of music, dance, literature and the sciences, this might have been blasphemous. "I try very hard," he told his mother after another dismal lesson one day, "but I always end up reciting instead of singing." Never a Rabindrasangeet aficionado, Sen eventually ended up a jazz and western classical buff. Now his son, Kabir, plays with a roving jazz band from Connecticut.