Vocal harmonies in the context of Eternity's Children

Surf music (also known as surf rock, surf pop, or surf guitar) is a genre of rock and roll associated with surf culture, particularly as found in Southern California. It was especially popular from 1958 to 1964 in two major forms. The first is instrumental surf, distinguished by reverb-heavy electric guitars played to evoke the sound of crashing waves, largely pioneered by Dick Dale and His Del-Tones. The second is vocal surf, which took elements of the original surf sound and added vocal harmonies, a movement led by the Beach Boys.

Dick Dale developed the surf sound from instrumental rock, where he added Middle Eastern and Mexican influences, a spring reverb, and rapid alternate picking characteristics. His regional hit "Let's Go Trippin'", in 1961, launched the surf music craze, inspiring many others to take up the approach.

The Beach Boys are an American rock band formed in Hawthorne, California, in 1961. The group's original lineup consisted of brothers Brian, Dennis, and Carl Wilson, their cousin Mike Love, and their friend Al Jardine. Distinguished by their vocal harmonies, adolescent-oriented lyrics, and musical ingenuity, they are one of the most influential acts of the rock era. The group drew on the music of older pop vocal groups, 1950s rock and roll, and black R&B to create their unique sound. Under Brian's direction, they often incorporated classical or jazz elements and pioneered unconventional recording techniques in innovative ways.

They formed as a garage band centered on Brian's songwriting and managed by the Wilsons' father, Murry. Jardine was briefly replaced by David Marks during 1962–1963. In 1962, they enjoyed their first national hit with "Surfin' Safari", beginning a string of hit singles that reflected a southern California youth culture of surfing, cars, and romance, dubbed the "California sound". They were one of the few American rock bands to sustain their commercial standing during the British Invasion. 1965 saw the addition of Bruce Johnston to the band, as well as Brian's move away from beach-going themes for more introspective lyrics and ambitious studio productions. In 1966, the Pet Sounds album and "Good Vibrations" single raised the group's prestige as rock innovators; both are now widely considered to be among the greatest and most influential works in popular music history.

Renaissance are an English progressive rock band, best known for their 1978 UK top 10 hit "Northern Lights" and progressive rock classics like "Carpet of the Sun", "Mother Russia", and "Ashes Are Burning". They developed a unique sound, combining a female lead vocal with a fusion of classical, folk, rock, and jazz influences. Characteristic elements of the Renaissance sound are Annie Haslam's wide vocal range, prominent piano accompaniment, orchestral arrangements and vocal harmonies.

The band was founded by vocalist Keith Relf and drummer Jim McCarty, formerly of the Yardbirds; along with John Hawken, Louis Cennamo and Relf's sister Jane Relf. They intended to put "something together with more of a classical influence". Lyricist Betty Thatcher attributed the classical influence specifically to Keith Relf: " I think it was mainly Keith. He always loved classical music, Keith, it was Canon [by] Pachelbel that was his favourite piece of music. He played it all the time, and he always thought that we should merge everything… and he did." Renaissance released their self-titled debut album in 1969, but fell apart during the sessions for their follow-up, Illusion (1971). New musicians were brought in to complete the record, and Renaissance was kept active through a period of fluctuating personnel until none of the original lineup remained, although McCarty continued providing compositions for the band to record for several more years. By 1972, a stable lineup consisting of Annie Haslam, Michael Dunford, John Tout, Jon Camp, and Terry Sullivan solidified. Aside from McCarty, they were assisted with lyrics on many songs from Cornish poet Betty Thatcher-Newsinger. From 1972 to 1979 Renaissance released seven studio albums, toured extensively, and sold out three nights in a row at Carnegie Hall with Tony Cox conducting the New York Philharmonic. The band's success was largely concentrated in the United States, where they built a cult following.