Walter Everett identifies the song's ending as an example of the Beatles' continued pioneering of the "fade-out–fade-in coda", further to their use of this device on the 1966 B-side "Rain". He cites "Helter Skelter" as a later example, as well as Led Zeppelin's 1969 track "Thank You" and, as a direct response to the Beatles' lead, both sides of the Rolling Stones' August 1967 single, "We Love You" and "Dandelion". According to historian David Simonelli, further to "Tomorrow Never Knows" in 1966, "Strawberry Fields Forever" and "Penny Lane" "establishthe Beatles as the most avant-garde [pop composers of the postwar era". He also says that the single heralded the group's brand of Romanticism as a central tenet of psychedelic rock, which ensured that "The Beatles' vision dominated the entire rock music world." In his contribution to the book "", Adam Gopnik describes the single as the 1960s' most important work of art and "the one that articulated the era's hopes for a crossover of pop art and high intricacy".