Luhrssen and Larson describe the pair's songwriting as "more melodically and harmonically unpredictable than that of their peers", and say that the Beatles' sound "struck many ears as outrageous, especially the falsetto leaps in songs such as 'She Loves You,' which might have been inspired by Little Richard but sounded unprecedented". "A Hard Day's Night", written primarily by Lennon, begins with a ringing chord most commonly identified as G7sus4. The specifics of its harmonic construction are often scrutinised, with many writers offering different interpretations of the chord. In 2001, "Rolling Stone" referred to the "Hard Day's Night" chord as the most famous in rock history. Another chord described as among the "most famous" in history is the sustained E major heard at the end of "A Day in the Life" from "Sgt. Pepper". Principally through McCartney's melody writing, the Beatles created many songs that became the most widely recorded of all time, including "And I Love Her", "Yesterday", "Michelle", "Eleanor Rigby", "Here, There and Everywhere", "The Fool on the Hill", "Hey Jude", "Blackbird", "Let It Be" and "The Long and Winding Road". According to Doggett, these mainly McCartney-written songs provided contemporary relevance for "light orchestras and crooners" in the easy listening category, persuaded adults that the new generation's musical tastes had merit, and "ensured that Lennon and McCartney would become the highest-earning composers in history". Harrison's songwriting widened the Beatles' range further, although his level of contribution remained limited by Lennon and McCartney's dominance throughout the band's career. His song "Something" was also widely covered, and earned rare praise from Sinatra, who described it as "the greatest love song of the past fifty years". Before the mid-1960s, competition between popular recording artists was typically measured by popularity and record sales, with artistic rivalries usually only occurring between jazz or classical musicians. Comparing its effect on 1960s popular music to Charlie Chaplin's on 1920s filmmaking, Gould credits the Beatles' increasing ambition "to write better songs" with inspiring "intense creative rivalries" between themselves and other acts who "felt a need to validate their success by experimenting with songwriting and record-making in ways that would have seemed unimaginable only a few years before." Author Robert Rodriguez writes that "The Beatles, Dylan, and the Rolling Stones have long been viewed as the Holy Trinity of 1960s rock, from whom every important development and innovation flowed."