Big Four may refer to:

Miles Dewey Davis III (May 26, 1926 – September 28, 1991) was an American jazz musician, trumpeter, bandleader, and composer. Widely considered one of the most influential musicians of the 20th century, Miles Davis was, with his musical groups, at the forefront of several major developments in jazz music, including bebop, cool jazz, hard bop, modal jazz, and jazz fusion.

Miles Dewey Davis was born on May 26, 1926, to an affluent African American family in Alton, Illinois. His father, Dr. Miles Henry Davis, was a dentist. In 1927 the family moved to East St. Louis, Illinois. They also owned a substantial ranch in northern Arkansas, where Davis learned to ride horses as a boy.

Davis' mother, Cleota Mae (Henry) Davis, wanted her son to learn the piano; she was a capable blues pianist but kept this fact hidden from her son. His musical studies began at 13, when his father gave him a trumpet and arranged lessons with local musician Elwood Buchanan. Davis later suggested that his father's instrument choice was made largely to irk his wife, who disliked the trumpet's sound. Against the fashion of the time, Buchanan stressed the importance of playing without vibrato; he was reported to have slapped Davis' knuckles every time he started using heavy vibrato. Davis would carry his clear signature tone throughout his career. He once remarked on its importance to him, saying, "I prefer a round sound with no attitude in it, like a round voice with not too much tremolo and not too much bass. Just right in the middle. If I can’t get that sound I can’t play anything."Clark Terry was another important early influence.^{[citation needed]}

Woodrow Charles "Woody" Herman (May 16, 1913 – October 29, 1987), was an American jazz clarinetist, alto and soprano saxophonist, singer, and big band leader. Leading various groups called "The Herd," Herman was one of the most popular of the 1930s and '40s bandleaders. His bands often played music that was experimental for their time. He was a featured halftime performer for Super Bowl VII.

Herman was born Woodrow Charles Thomas Herrman in Milwaukee, Wisconsin on May 16, 1913. His parents were Otto and Myrtle Herrman. His father had a deep love for show business and this influenced Woody Herman at an early age. As a child he worked as a singer in vaudeville, then became a professional saxophone player at age 15. In 1931, he met Charlotte Neste, an aspiring actress; they married on September 27, 1936. Woody Herman joined the Tom Gerun band and his first recorded vocals were "Lonesome Me" and "My Heart's At Ease". Herman also performed with the Harry Sosnick orchestra,Gus Arnheim and Isham Jones. Isham Jones wrote many popular songs, including "It Had To Be You" and at some point was tiring of the demands of leading a band. Jones wanted to live off the residuals of his songs; Woody Herman saw the chance to lead his former band, and eventually acquired the remains of the orchestra after Jones' retirement.