Folk music includes both traditional music and the genre that evolved from it during the 20th century folk revival. The term originated in the 19th century but is often applied to music that is older than that. Certain types of folk music are also called world music.

Traditional folk music has been defined in several ways: as music transmitted by mouth, as music of the lower classes, and as music with unknown composers. It has been contrasted with commercial and classical styles. One meaning often given is that of old songs, with no known composers; another is music that has been transmitted and evolved by a process of oral transmission or performed by custom over a long period of time.

Starting in the mid-20th century a new form of popular folk music evolved from traditional folk music. This process and period is called the (second) folk revival and reached a zenith in the 1960s. This form of music is sometimes called contemporary folk music or folk revival music to distinguish it from earlier folk forms. This type of folk music also includes fusion genres such as folk rock, folk metal, electric folk, and others. While contemporary folk music is a genre generally distinct from traditional folk music, in English it shares the same name, and it often shares the same performers and venues as traditional folk music. Even individual songs may be a blend of the two.

Loudon Snowden Wainwright III (born September 5, 1946) is a Grammy Award-winning American songwriter, folk singer, humorist, and actor. He is the father of musicians Rufus Wainwright, Martha Wainwright and Lucy Wainwright Roche, brother of Sloan Wainwright, and the former husband of the late folk singer Kate McGarrigle.

To date, Wainwright has released 22 studio albums. Reflecting upon his career, in 1999, Wainwright stated "you could characterize the catalog as somewhat checkered, although I prefer to think of it as a tapestry."

Wainwright was born in Chapel Hill, North Carolina, the son of Martha Taylor, a yoga teacher, and Loudon Wainwright, Jr., a columnist and editor for Life magazine. His father was not a professional musician but he did play piano and wrote some songs, exposing his children to musicians such as Tom Lehrer and Stan Freberg who were later cited as influences. Wainwright grew up in Bedford, New York, in Westchester County. Among his sisters is Sloan Wainwright, also a singer. He graduated from St. Andrew's School in Delaware. He is a direct descendant of Peter Stuyvesant, the last Director-General of New Netherland (present-day New York State).

Peter "Pete" Seeger (born May 3, 1919) is an American folk singer and an iconic figure in the mid-20th-century American folk music revival. A fixture on nationwide radio in the 1940s, he also had a string of hit records during the early 1950s as a member of The Weavers, most notably their recording of Lead Belly's "Goodnight, Irene", which topped the charts for 13 weeks in 1950. Members of The Weavers were blacklisted during the McCarthy Era. In the 1960s, he re-emerged on the public scene as a prominent singer of protest music in support of international disarmament, civil rights, and environmental causes.

As a song writer, he is best known as the author or co-author of "Where Have All the Flowers Gone?", "If I Had a Hammer (The Hammer Song)", (composed with Lee Hays of The Weavers), and "Turn, Turn, Turn!", which have been recorded by many artists both in and outside the folk revival movement and are still sung throughout the world. "Flowers" was a hit recording for The Kingston Trio (1962); Marlene Dietrich, who recorded it in English, German and French (1962); and Johnny Rivers (1965). "If I Had a Hammer" was a hit for Peter, Paul & Mary (1962) and Trini Lopez (1963), while The Byrds popularized "Turn, Turn, Turn!" in the mid-1960s, as did Judy Collins in 1964, and The Seekers in 1966. Seeger was one of the folksingers most responsible for popularizing the spiritual "We Shall Overcome" (also recorded by Joan Baez and many other singer-activists) that became the acknowledged anthem of the 1960s American Civil Rights Movement, soon after folk singer and activist Guy Carawan introduced it at the founding meeting of the Student Nonviolent Coordinating Committee (SNCC) in 1960. In the PBS "American Masters" episode Pete Seeger: The Power of Song, Seeger states it was he who changed the lyric from the traditional "We will overcome" to the more singable "We shall overcome".

John R. "Johnny" Cash (February 26, 1932 – September 12, 2003), was an American singer-songwriter, actor, and author, who has been called one of the most influential musicians of the 20th century. Although he is primarily remembered as a country music icon, his songs and sound spanned many other genres including rockabilly and rock and roll—especially early in his career—as well as blues, folk, and gospel. This crossover appeal led to Cash being inducted in the Country Music Hall of Fame, the Rock and Roll Hall of Fame, and Gospel Music Hall of Fame.

Cash was known for his deep, distinctive bass-baritone voice; for the "boom-chicka-boom" sound of his Tennessee Three backing band; for his rebelliousness, coupled with an increasingly somber and humble demeanor; for providing free concerts inside prison walls; and for his dark performance clothing, which earned him the nickname "The Man in Black". He traditionally started his concerts by saying, "Hello, I'm Johnny Cash." and usually following it up with his standard "Folsom Prison Blues".

Liu Fang (simplified Chinese: 刘芳; traditional Chinese: 劉芳) (born 1974) is one of the most prominent pipa players in the world. Described in the media as the "empress of pipa" (L'actualité), "divine mediator" (World), "the greatest ambassadress of the art of the pipa" (La presse), Liu Fang is known as “possessing virtuoso technique, grace and a unique empathy toward the music she plays – whether it is a traditional and folk tune or a modern Western composition” (All Music Guide). "She has an extraordinary focused, poised presence in her manner and her playing. In a lesser player this is just a trained formality; the body of material and techniques for her instruments is extremely highly developed, passed down through centuries. But Liu Fang’s total devotion to her playing has moved her beyond perfect execution to the creativity and flexibility that marks a true musician."(in the fRoots Magazine, 06.2006).

Born in Kunming in the Chinese province of Yunnan, she began playing the pipa at the age of 6. Her first solo public performance was at the age of 9. In 1986, at age 11, she played for Queen Elizabeth II. Her studies at the Shanghai Conservatory of Music broadened her musical range and allowed her to study the guzheng. At the age of 22, Liu Fang immigrated to Canada and is now a Canadian citizen, currently residing in Montreal. The decision to move to Quebec allowed her virtuosic playing to reach a wider international audience. Since 1999, she has performed hundreds of solo concerts featuring Chinese traditional and classical music on her two solo instruments - pipa and guzheng. Her profile has risen due to her rich and deeply spiritual performances as well as a wide ranging repertoire that features music from Chinese classical and folk traditions (including pieces rarely heard) as well as contemporary works from both east and west.