Aaron Copland described musical creativity as “a confirmation of life.” While a group of Westchester visionaries succeeded during the seemingly endless dark days of World War II 75 years ago in establishing an artistic oasis that became the Hoff-Barthelson Music School, leading composers in the U.S. and Europe were producing thrilling, life-affirming musical works. Acclaimed pianist and lecturer Michael Boriskin leads a wide-ranging tour through some of the most iconic and remarkable music created during that notable year of 1944-45…