The Billboard charts tabulate the relative weekly popularity of songs or albums in the United States. The results are published in Billboard magazine. The two primary charts – the Hot 100 (top 100 singles) and the Billboard 200 (top 200 albums) – factor in airplay, as well as music sales in all relevant formats.

On January 4, 1936, Billboard magazine published its first music hit parade. The first Music Popularity Chart was calculated in July 1940. A variety of song charts followed, which were eventually consolidated into the Hot 100 by mid-1958. The Hot 100 currently combines single sales, radio airplay and digital downloads.

All of Billboard's charts use this basic formula. What separates the charts is which stations and stores are used – each musical genre having a core audience or retail group. Each genre's department at Billboard is headed up by a chart manager, who makes these determinations.

For many years, a song had to be commercially available as a single to be considered for any of Billboard's charts. At the time, instead of using SoundScan or BDS, Billboard obtained its data from manual reports filled out by radio stations and stores. According to the 50th Anniversary issue of Billboard, prior to the official implementation of Nielsen SoundScan tracking in November 1991, many radio stations and retail stores removed songs from their manual reports after the associated record labels stopped promoting a particular single. Thus songs fell quickly after peaking and had shorter chart lives. In 1990, the country singles chart was the first chart to use SoundScan and BDS. They were followed by the Hot 100 and the R&B chart in 1991. Today, all of Billboard's charts use this technology.

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]}

John William Coltrane (September 23, 1926 – July 17, 1967) was an American jazz saxophonist and composer. Working in the bebop and hard bop idioms early in his career, Coltrane helped pioneer the use of modes in jazz and later was at the forefront of free jazz. He organized at least fifty recording sessions as a leader during his recording career, and appeared as a sideman on many other albums, notably with trumpeter Miles Davis and pianist Thelonious Monk.

As his career progressed, Coltrane and his music took on an increasingly spiritual dimension. His second wife was pianist Alice Coltrane, and their son Ravi Coltrane is also a saxophonist. Coltrane influenced innumerable musicians, and remains one of the most significant tenor saxophonists in jazz history. He received many posthumous awards and recognitions, including canonization by the African Orthodox Church as Saint John William Coltrane. In 2007, Coltrane was awarded the Pulitzer Prize Special Citation for his "masterful improvisation, supreme musicianship and iconic centrality to the history of jazz."

Arthur "Art" Blakey (October 11, 1919 – October 16, 1990), known later as Abdullah Ibn Buhaina, was an American Grammy Award-winning jazz drummer and bandleader. He was a member of the Ahmadiyya Muslim Community.

Along with Kenny Clarke and Max Roach, he was one of the inventors of the modern bebop style of drumming. He is known as a powerful musician and a vital groover; his brand of bluesy, funky hard bop was and continues to be profoundly influential on mainstream jazz. For more than 30 years his band, Art Blakey and the Jazz Messengers, included many young musicians who went on to become prominent names in jazz. The band's legacy is thus not only known for the music it produced, but as a proving ground for several generations of jazz musicians; Blakey's groups are matched only by those of Miles Davis in this regard.

Blakey was inducted into the Jazz Hall of Fame (in 1982), the Grammy Hall of Fame (in 2001), and was awarded the Grammy Lifetime Achievement Award in 2005.

Blakey was born in Pittsburgh, Pennsylvania. By the time he was a teenager, he was playing the piano full-time, leading a commercial band. Shortly afterwards, reputedly because he thought he would be unable to compete with the emerging pianist Erroll Garner, he taught himself to play the drums in the aggressive swing style of Chick Webb, Sid Catlett and Ray Bauduc. He joined Mary Lou Williams as a drummer for an engagement in New York in autumn 1942. He then toured with the Fletcher Henderson Orchestra (1939–1942). During his years with Billy Eckstine’s big band (1944–7), Blakey became associated with the bebop movement, along with his fellow band members Miles Davis, Dexter Gordon, Fats Navarro and others.

William John Evans, known as Bill Evans (August 16, 1929–September 15, 1980) was an American jazz pianist. His use of impressionist harmony, inventive interpretation of traditional jazz repertoire, and trademark rhythmically independent, "singing" melodic lines influenced a generation of pianists. He is considered by some to be the most influential post-World War II jazz pianist. Evans had a distinct playing posture in which his neck would often be stooped very low, and his face parallel to the piano.

Evans is an inductee of the Down Beat Jazz Hall of Fame.

Bill Evans was born in Plainfield, New Jersey, United States, to a mother of Rusyn ancestry and a father of Welsh descent. He received his first musical training at his mother's church. Evans' mother was an amateur pianist with an interest in modern classical composers, and Evans began classical piano lessons at age six. He also became a proficient flautist by age 13 and could play the violin.

At age 12, Evans filled in for his older brother Harry in Buddy Valentino's band. At this age he was able to interpret classical music, but he couldn't improvise. In the beginning, he played exactly what was written in the sheet, but soon started trying to improvise, while learning about harmonies in the songs and how to alter them. Meanwhile, he was playing dance music (and jazz) at home, in a recording studio he built in his family's basement.. In the late 1940s, Evans played boogie woogie in various New Jersey clubs. He attended Southeastern Louisiana University on a music scholarship, and in 1950 performed Beethoven's Third Piano Concerto on his senior recital there, graduating with a degree in piano performance and teaching. He was also among the founding members of SLU's Delta Omega Chapter of Phi Mu Alpha Sinfonia, and played quarterback for the fraternity's football team, helping them win the school's 1949 intramural tournament.