The Who in the context of Monterey Pop Festival

Mod, from the word modernist, is a subculture that began in late 1950s London and spread throughout Great Britain, eventually influencing fashions and trends in other countries. It continues today on a smaller scale. Focused on music and fashion, the subculture has its roots in a small group of stylish London-based young men and women in the late 1950s who were termed modernists because they listened to modern jazz.

Elements of the mod subculture include fashion (often tailor-made suits) and music (including soul, rhythm and blues and ska, but mainly jazz). They rode motor scooters, usually Lambrettas or Vespas. In the mid-1960s, members of the subculture listened to pop groups with rhythm and blues (R&B) influences, such as the Who and Small Faces. The original mod scene was associated with amphetamine-fuelled all-night jazz dancing at clubs.

A rock band or pop band is a small musical ensemble that performs rock music, pop music, or a related genre. A four-piece band is the most common configuration in rock and pop music. In the early years, the configuration was typically two guitarists (a lead guitarist and a rhythm guitarist, with one of them singing lead vocals), a bassist, and a drummer (e.g. the Beatles and KISS). Another common formation is a vocalist who does not play an instrument, electric guitarist, bass guitarist, and a drummer (e.g. the Who, the Monkees, Led Zeppelin and U2). Sometimes, in addition to electric guitars, electric bass, and drums, also a keyboardist (especially a pianist) plays.

Additionally, rock and pop bands can also include boy bands or girl bands, which many times have bands where the members do not play any instruments but sing and dance instead. Such is the case of Menudo, the Spice Girls and K-pop groups, for example.

Sir Peter Thomas Blake CBE RDI RA (born 25 June 1932) is an English pop artist. He co-created the sleeve design for the Beatles' 1967 album Sgt. Pepper's Lonely Hearts Club Band. His other works include the covers for two of The Who's albums, the cover of the Band Aid single "Do They Know It's Christmas?", and the Live Aid concert poster. Blake also designed the 2012 Brit Award statuette.

Blake is a prominent figure in the pop art movement. Central to his paintings is his interest in images from popular culture, which have infused his collages. In 2002 he was knighted at Buckingham Palace for his services to art.

Hard rock or heavy rock is a heavier subgenre of rock music typified by aggressive vocals and distorted electric guitars. Hard rock began in the mid-1960s with the garage, psychedelic and blues rock movements. Some of the earliest hard rock music was produced by the Kinks, the Who, the Beatles, the Rolling Stones, Cream, Vanilla Fudge, and the Jimi Hendrix Experience. In the late 1960s, bands such as Blue Cheer, the Jeff Beck Group, Iron Butterfly, Led Zeppelin, Creedence Clearwater Revival, Golden Earring, Steppenwolf, Grand Funk Railroad, Free, and Deep Purple also produced hard rock.

The genre developed into a major form of popular music in the 1970s, with the Who, Led Zeppelin and Deep Purple being joined by Black Sabbath, Alice Cooper, Aerosmith, Kiss, Queen, AC/DC, Thin Lizzy and Van Halen. During the 1980s, some hard rock bands moved away from their hard rock roots and more towards pop rock. Established bands made a comeback in the mid-1980s and hard rock reached a commercial peak in the 1980s with glam metal bands such as Mötley Crüe, Bon Jovi and Def Leppard as well as the rawer sounds of Guns N' Roses which followed with great success in the later part of that decade.

Polydor, also known as Polydor Records, is a British record label that operates as part of Universal Music Group. It has a close relationship with Universal's Interscope Geffen A&M Records label, which distributes Polydor's releases in the United States. In turn, Polydor distributes Interscope releases in the United Kingdom. Polydor Records Ltd. was established in London in 1954 as a British subsidiary of German company Deutsche Grammophon/Schallplatte Grammophon GmbH. It was renamed Polydor Ltd. in 1972. The company is usually mentioned as "Polydor Ltd. (UK)", or a similar form, for holding copyrights.

Notable current and past artists signed to the label include Rainbow, Siouxsie and the Banshees, Yngwie J. Malmsteen, the Cure, James Brown, Ray, Goodman & Brown, Atlanta Rhythm Section, John Mayall, Deep Purple, Cream, the Moody Blues, the Who, Jimi Hendrix, Focus, Fishmans, Bee Gees, Lana Del Rey, Stephen Fretwell, the Jam, Style Council, the Shadows, James Last, Eric Clapton, Gloria Gaynor, Level 42, Sam Fender, S Club, Girls Aloud, Cheryl, Raye, Ellie Goulding, Jesy Nelson, Cian Ducrot and Destroy Lonely.

The British Invasion was a cultural phenomenon of the mid-late 1960s, when rock and pop music acts from the United Kingdom and other aspects of British culture became popular in the United States with significant influence on the rising "counterculture" on both sides of the Atlantic Ocean. British pop and rock groups such as the Beatles, the Rolling Stones, Bee Gees, Gerry and the Pacemakers, the Who, the Kinks, the Zombies, Small Faces, the Dave Clark Five, the Spencer Davis Group, the Yardbirds, Them, Manfred Mann, the Searchers, Billy J. Kramer and the Dakotas, Freddie and the Dreamers, the Hollies, Herman's Hermits, Chad and Jeremy, Peter and Gordon, the Animals, the Moody Blues, the Mindbenders, the Troggs, John Mayall & the Bluesbreakers, Cream, Traffic, the Pretty Things, and Procol Harum, as well as solo singers such as Dusty Springfield, Cilla Black, Petula Clark, Tom Jones, Donovan, Shirley Bassey and Marianne Faithfull were at the forefront of the "invasion."

The Swinging Sixties was a youth-driven cultural revolution that took place in the United Kingdom during the mid-to-late 1960s, emphasising modernity and fun-loving hedonism, with Swinging London denoted as its centre. It saw a flourishing in art, music and fashion, and was symbolised by the city's "pop and fashion exports", such as the Beatles, as the multimedia leaders of the British Invasion of musical acts; the mod and psychedelic subcultures; Mary Quant's miniskirt designs; popular fashion models such as Twiggy and Jean Shrimpton; the iconic status of popular shopping areas such as London's King's Road, Kensington and Carnaby Street; the political activism of the anti-nuclear movement; and the sexual liberation movement.

Music was an essential part of the revolution, with "the London sound" being regarded as including the Beatles, the Rolling Stones, the Who, the Kinks and the Small Faces, bands that were additionally the mainstay of pirate radio stations like Radio Caroline, Wonderful Radio London and Swinging Radio England. Swinging London also reached British cinema, which according to the British Film Institute "saw a surge in formal experimentation, freedom of expression, colour, and comedy", with films that explored countercultural and satirical themes. During this period, "creative types of all kinds gravitated to the capitol, from artists and writers to magazine publishers, photographers, advertisers, film-makers and product designers".

A rock musical is a musical theatre work with rock music. The genre of rock musical may overlap somewhat with album musicals, concept albums and song cycles, as they sometimes tell a story through the rock music, and some album musicals and concept albums become rock musicals. Notable examples of rock musicals include Next to Normal, Spring Awakening, Rent, Grease, and Hair. The Who's Tommy and other rock operas are sometimes presented on stage as a musical.

A rock opera is a collection of rock music songs, especially a concept album, with lyrics that relate to a common story. The use of various character roles within the song lyrics is a common storytelling device. The success of rock opera has inspired similar works in other musical styles, such as rap opera.

Unlike classical opera, rock operas are typically not scripted for theatrical production, like a classical oratorio, though some have been adapted as rock musicals.