The counterculture of the 1960s was an anti-establishment cultural phenomenon that developed throughout much of the Western world between the mid-1960s and the mid-1970s. The aggregate movement gained momentum as the civil rights movement in the United States continued to grow, and with the intensification of the Vietnam War, it would later become revolutionary to some. As the 1960s progressed, widespread social tensions also developed concerning other issues, and tended to flow along generational lines regarding human sexuality, women's rights, traditional modes of authority, rights of non-white people, end of racial segregation and white supremacy, experimentation with psychoactive drugs, and differing interpretations of the American Dream. Many key movements related to these issues were born or advanced within the counterculture of the 1960s.As the era unfolded, what emerged were new cultural forms and a dynamic subculture that celebrated experimentation, modern incarnations of Bohemianism, and the rise of the hippie and other alternative lifestyles. This embrace of experimentation is particularly notable in the works of popular musical acts such as the Beatles and Bob Dylan, as well as of New Hollywood filmmakers, whose works became far less restricted by censorship. Within and across many disciplines, many other creative artists, authors, and thinkers helped define the counterculture movement. Everyday fashion experienced a decline of the suit and especially of the wearing of hats; styles based around jeans, for both men and women, became an important fashion movement that has continued up to the present day.

Several factors distinguished the counterculture of the 1960s from the anti-authoritarian movements of previous eras. The post-World War II baby boom generated an unprecedented number of potentially disaffected youth as prospective participants in a rethinking of the direction of the United States and other democratic societies. Post-war affluence allowed much of the counterculture generation to move beyond the provision of the material necessities of life that had preoccupied their Depression-era parents. The era was also notable in that a significant portion of the array of behaviors and "causes" within the larger movement were quickly assimilated within mainstream society, particularly in the US, even though counterculture participants numbered in the clear minority within their respective national populations.In general, the counterculture era commenced in earnest with the assassination of John F. Kennedy in November 1963, became absorbed into the popular culture with the termination of US combat military involvement in Southeast Asia, and ultimately concluded with the end of the draft in 1973 and the resignation of President Richard Nixon in August 1974.

Hair: The American Tribal Love-Rock Musical is a rock musical with a book and lyrics by Gerome Ragni and James Rado and music by Galt MacDermot. The work reflects the creators' observations of the hippie counterculture and sexual revolution of the late 1960s, and several of its songs became anthems of the anti-Vietnam War peace movement. The musical's profanity, its depiction of the use of illegal drugs, its treatment of sexuality, its irreverence for the American flag, and its nude scene caused much comment and controversy. The work broke new ground in musical theatre by defining the genre of "rock musical", using a racially integrated cast, and inviting the audience onstage for a "Be-In" finale.Hair tells the story of the "tribe", a group of politically active, long-haired hippies of the "Age of Aquarius" living a bohemian life in New York City and fighting against conscription into the Vietnam War. Claude, his good friend Berger, their roommate Sheila and their friends struggle to balance their young lives, loves, and the sexual revolution with their rebellion against the war and their conservative parents and society. Ultimately, Claude must decide whether to resist the draft as his friends have done, or to serve in Vietnam, compromising his pacifist principles and risking his life.

After an off-Broadway debut on October 17, 1967, at Joseph Papp's Public Theater and a run at the Cheetah nightclub from December 1967 through January 1968, the show opened on Broadway in April 1968 and ran for 1,750 performances. Simultaneous productions in cities across the United States and Europe followed shortly thereafter, including a successful London production that ran for 1,997 performances. Since then, numerous productions have been staged around the world, spawning dozens of recordings of the musical, including the 3 million-selling original Broadway cast recording. Some of the songs from its score became Top 10 hits, and a feature film adaptation was released in 1979. A Broadway revival opened in 2009, earning strong reviews and winning the Tony Award and Drama Desk Award for Best Revival of a Musical. In 2008, Time wrote, "Today Hair seems, if anything, more daring than ever."