A jam session is a musical act where musicians play (i.e. "jam") by improvising without extensive preparation or predefined arrangements. Jam sessions are often used by musicians to develop new material, find suitable arrangements, or simply as a social gathering and communal practice session. Jam sessions may be based upon existing songs or forms, may be loosely based on an agreed chord progression or chart suggested by one participant, or may be wholly improvisational. Jam sessions can range from very loose gatherings of amateurs to sophisticated improvised recording sessions intended to be edited and released to the public.

The New York scene during World War II was famous for its after-hours jam sessions. One of the most famous was the regular after-hours jam at Minton's Playhouse in New York City that ran in the 1940s and early 1950s. The jam sessions at Minton's were a fertile meeting place and proving ground for both established soloists like Ben Webster and Lester Young, and the younger jazz musicians who would soon become leading exponents of the bebop movement, including Thelonious Monk (Minton's house pianist), Charlie Parker, and Dizzy Gillespie. The Minton's jams were legendary for their highly competitive "cutting contests", in which soloists would try to keep up with the house band and outdo each other in improvisation skill.

Carlos Augusto Alves Santana (born July 20, 1947) is a Mexican and American rock guitarist. Santana became famous in the late 1960s and early 1970s with his band, Santana, which pioneered rock, Latin music and jazz fusion. The band's sound featured his melodic, blues-based guitar lines set against Latin and African rhythms featuring percussion instruments such as timbales and congas not generally heard in rock music. Santana continued to work in these forms over the following decades. He experienced a resurgence of popularity and critical acclaim in the late 1990s. In 2003, Rolling Stone magazine listed Santana at number 15 on their list of the 100 Greatest Guitarists of All Time. He has won 10 Grammy Awards and 3 Latin Grammy Awards.

Santana was born in Autlán de Navarro, Jalisco, Mexico. Carlos learned to play the violin at age five and the guitar at age eight. His younger brother, Jorge Santana, would also become a professional guitarist. Young Carlos was heavily influenced by Ritchie Valens at a time when there were very few Latinos in American rock and pop music. The family moved from Autlán de Navarro to Tijuana In La Colonia Libertad, the city on Mexico's border with California, and then San Francisco. Carlos stayed in Tijuana but joined his family in San Francisco later and graduated from James Lick Middle School and Mission High School there. He graduated from Mission High in 1965. Carlos was accepted into the California State University, Northridge and Humboldt State University, but turned down both of the offers. Javier Bátiz, a famous guitarist from Tijuana, was said to have been Carlos's guitar teacher who taught him to play a different style of guitar soloing. After learning Javier Batiz's techniques, Santana would make them his own as well.

George "Buddy" Guy (born July 30, 1936) is an American blues guitarist and singer. Critically acclaimed, he is a pioneer of the Chicago blues sound and has served as an influence to some of the most notable musicians of his generation. "A key influence on Eric Clapton, Jimi Hendrix and Stevie Ray Vaughan, Buddy Guy put the Louisiana hurricane in 1960s electric Chicago blues as a member of Muddy Waters' band and as a house guitarist at Chess Records. A native of the Baton Rouge area, he combined a blazing modernism with a fierce grip on his roots, playing frantic leads heavy with swampy funk on Howlin' Wolf's 'Killing Floor' and Koko Taylor's 'Wang Dang Doodle' as well as on his own Chess sides and the fine series of records he made with harp man Junior Wells. One of the last active connections to the golden age of Chess, Guy still plays with his original fire."

Ranked thirtieth in Rolling Stone magazine's list of the "100 Greatest Guitarists of All Time", Guy is known for his showmanship on stage: playing his guitar with drumsticks or strolling into the audience while playing solos. His song "Stone Crazy" was ranked seventy-eighth in list of the 100 Greatest Guitar Songs of All Time also of Rolling Stone.

Nile Gregory Rodgers (born September 19, 1952, New York City) is an American musician, producer, composer, arranger, and guitarist.

Rodgers began his career as a session guitarist in New York, touring with the Sesame Street band in his teens, and then working in the house band at Harlem's world famous Apollo Theater, playing behind Screaming Jay Hawkins, Maxine Brown, Aretha Franklin, Ben E. King, Betty Wright, Earl Lewis and the Channels, Parliament Funkadelic, and many other legendary R&B artists.

Nile met bassist Bernard Edwards in 1970. Together they formed The Big Apple Band that backed R&B act New York City ("I’m Doing Fine Now"). The band’s one hit allowed them to tour extensively, even opening for The Jackson 5 on the American leg of their first world tour in 1973. The band dissolved after their second album failed to yield a hit, but Nile and Bernard joined forces with drummer Tony Thompson, and worked and recorded as a Funk Rock band called The Boys, which played numerous gigs up and down the East Coast. Despite major label interest in their demos, they could not get a record deal when the record companies discovered they were black, as they thought that black rock artists would be too hard to promote. The band continued playing mostly local bars.

John Lee Hooker (August 22, 1917 – June 21, 2001) was a highly influential American blues singer-songwriter and guitarist.

Hooker began his life as the son of a sharecropper, William Hooker, and rose to prominence performing his own unique style of what was originally a unique brand of country blues. He developed a 'talking blues' style that was his trademark. Though similar to the early Delta blues, his music was metrically free. John Lee Hooker could be said to embody his own unique genre of the blues, often incorporating the boogie-woogie piano style and a driving rhythm into his blues guitar playing and singing. His best known songs include "Boogie Chillen'" (1948), "I'm in the Mood" (1951) and "Boom Boom" (1962), the first two reaching R&B #1 in the Billboard charts.

There is some debate as to the year of Hooker's birth in Coahoma County, Mississippi, the youngest of the eleven children of William Hooker (1871–1923), a sharecropper and Baptist preacher, and Minnie Ramsey (born 1875, date of death unknown); according to his official website, he was born on August 22, 1917.