Final answer:
The incorrect statement about Glenn Miller is that his band's music style was primarily heavy metal. Glenn Miller was a famous trombonist and bandleader during the Swing Era, and he served in the Army Air Forces during WWII, not as a fighter pilot.
Step-by-step explanation:
The statement about Glenn Miller that is not true is Option 4: "The band's music style was primarily heavy metal." Glenn Miller was renowned as a trombonist and bandleader during the Swing Era. Miller's band achieved widespread success in the 1930s and 1940s with their signature jazz and swing music. While Glenn Miller did serve during World War II, he was not a fighter pilot; instead, he joined the Army Air Forces where he led the Army Air Force Band to boost troop morale. Heavy metal is a genre that emerged much later, not associated with Glenn Miller.