Hal Kemp was among the most popular bandleaders of the '30s, scoring a long string of dance band hits. He was also an extremely lucky, and extremely talented musician, in the right place at the right time across his career, until a night in December of 1940 when his luck ran out. Kemp was the leader of what was generally identified as a "sweet" (or pop) band, as opposed to a "hot" (or jazz) band -- he was a rival to Guy Lombardo and Sammy Kaye, among others, and for a time was one of the top dance band leaders in the country. That was in the '30s, but Kemp had started a decade...