The Beatles (1960–1970): John, Paul, George, and Ringo released twelve studio albums in eight years and fundamentally rewrote the rules of pop music along the way. Sgt. Pepper's Lonely Hearts Club Band (1967) pioneered the concept album and pushed studio experimentation, tape loops, orchestral overdubs, backwards recording, into the mainstream, while earlier records like Rubber Soul and Revolver introduced sitar, string arrangements, and modal harmony to Top 40 radio. Their February 1964 appearance on The Ed Sullivan Show drew an estimated 73 million viewers, igniting the British Invasion and reshaping American youth culture overnight. As songwriters, Lennon-McCartney's catalog produced 20 U.S. number-one singles, more than any other songwriting duo in chart history. By the time they split in 1970, they had sold an estimated 600 million-plus records worldwide and left almost no corner of popular music, from psychedelia to heavy metal to hip-hop sampling, untouched by their influence. is leading so far with 100%.
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