The Four Freshmen is a pioneering American vocal harmony group formed in 1948 at Butler University in Indianapolis. Known for their distinctive sound, which blends intricate jazz arrangements and tight vocal harmonies, the group significantly influenced later acts like The Beach Boys and The Manhattan Transfer. Originally comprised of Bob Flanigan, Don Barbour, Ross Barbour, and Hal Kratzsch, the ensemble has undergone numerous lineup changes over the decades but continues to perform and record. Their innovative style and timeless classics like "It's a Blue World" and "Graduation Day" have left a lasting impact on the music world.