Glenn MillerA bandleader, trombonist, composer, and arranger, Glenn Miller was one of America's most prominent musical figures during the big band era in the 1930s and first half of the 1940s. Though his career as a bandleader was brief, lasting only seven years, it was highly productive -- ordings included "In the Mood," "Tuxedo Junction," and "Pennsylvania 6-5000," all of which symbolized the swing era for millions of people around the world.