Elton John and Billy Joel share the most visible creative signature in 1970s pop: a piano at the center of everything, a voice built around it, and a gift for melody that sounds inevitable the moment you hear it. The comparison gets made constantly, as though the instrument is the whole explanation. The real story is that these two men arrived at nearly identical results through creative processes that were structural mirror images of each other, and understanding that gap explains why their music sounds the way it does, and why the pairing has always been more interesting than a simple rivalry.

Elton's process started with an accident. In 1967, he and Bernie Taupin each answered a talent advertisement placed by Liberty Records in the New Musical Express. The A&R man behind the desk was Ray Williams. Neither Elton nor Bernie passed the audition, but when Elton admitted he couldn't write lyrics, Williams handed him a sealed envelope from a pile of lyric submissions. Elton opened it on the London Underground ride home. Inside were poems by Taupin. The two began collaborating almost immediately, and the method they settled on was unusual to the point of being strange: Taupin would write the words, send them to Elton, and Elton would sit at the piano alone and set them to music. They rarely wrote in the same room. The results of that arrangement include "Tiny Dancer," "Rocket Man," "Levon," "Candle in the Wind," "Bennie and the Jets," and "Goodbye Yellow Brick Road."

By 1972, when Elton recorded "Honky Château" at the Château d'Hérouville outside Paris, the hit-making machine was fully assembled. The album was the first to feature his road band, Davey Johnstone on guitar, Dee Murray on bass, and Nigel Olsson on drums, as the sole core group of studio musicians, with Gus Dudgeon producing and Ken Scott engineering. Previous albums had used session players for most tracks; "Honky Château" was the first time Elton could walk onstage and say, as Dudgeon put it, "This is my band, this is my album." It reached number one on the US Billboard 200, the first of seven consecutive US number one albums.

Billy Joel's process was the opposite in almost every structural respect. He wrote everything himself: melody, lyric, arrangement idea, the whole architecture. "Piano Man," his signature song, came directly from his own life. After his debut album, "Cold Spring Harbor" (1971), was marred by a mastering error that sped up the recordings and made his voice sound unnaturally high, Joel moved to Los Angeles and spent six months playing piano under the name Bill Martin at the Executive Room bar in the Wilshire district. The patrons he watched became the characters in the song: the old man, the bartender John, the real estate novelist Paul, the naval serviceman Davy. When "Piano Man" was released as a single in November 1973, Columbia Records cut it from its original runtime down to 3:05 for radio. Joel was so annoyed that he wrote "The Entertainer" as a direct response, with the lyric: "It was a beautiful song, but it ran too long. If you're gonna have a hit, you gotta make it fit. So they cut it down to 3:05." The song peaked at No. 25 on the Billboard Hot 100 in April 1974.

His real commercial breakthrough came with "The Stranger" in 1977, produced by Phil Ramone, which became Columbia Records' best-selling album release at the time, surpassing Simon and Garfunkel's "Bridge Over Troubled Water." The album's four US singles were "Just the Way You Are," "Movin' Out (Anthony's Song)," "She's Always a Woman," and "Only the Good Die Young." Beyond those, "Scenes from an Italian Restaurant" and "Vienna" became concert staples that defined Joel's live shows for decades. He wrote all of them himself. He wrote all 33 of his Top 40 hits himself.

The creative gap between the two men is audible in the music. Elton's melodies carry the weight of someone who received words as a prompt and had to find the emotional logic inside them at the keyboard, alone. "Tiny Dancer" sounds like a man discovering what the lyric means as he plays it. Joel's songs carry the weight of a single intelligence shaping every element simultaneously. "Scenes from an Italian Restaurant" is a short story and a suite and a pop song at once, because the same person decided it would be all three. The New York Times, reviewing their joint concerts, described them as "two gifted, idiosyncratic artists who exist between pop and rock, where Broadway show tunes, classical compositions, ragtime, gospel and rock-and-roll mingle freely." That description fits both men and neither one completely, which is the point. They arrived at the same FM-radio address by entirely different routes.

The routes crossed in 1994, when the Face to Face tours began and became, by any measure, the longest-running and most successful concert tandem in pop music history. The 2003 leg grossed over $46 million in 24 dates. Promotional materials for the first tour billed it simply as "Rocket Man meets Piano Man." During the shows, they played their own songs, each other's songs, and performed duets. Elton covered "New York State of Mind," Joel covered "Goodbye Yellow Brick Road." The pairing worked in the arena because it clarified something audiences had always sensed: these are two distinct sensibilities sharing a continent. The tension between them was real enough that it eventually produced a public falling-out in 2011, when Elton criticized Joel in a Rolling Stone interview, and Joel responded in kind. By 2012, Joel had said he wouldn't tour with Elton anymore because the shared setlist constrained what he could play. The feud was, in its way, as revealing as the partnership. Two people who do the same job in fundamentally different ways will eventually disagree about what the job is.

What makes the comparison worth returning to is that neither approach is a shortcut. Taupin's lyrics gave Elton a kind of emotional freedom at the piano, the freedom of someone interpreting a text rather than writing it. Joel's total authorship gave him a narrative density that few pop records of the era could match. "Captain Fantastic and the Brown Dirt Cowboy" (1975), Elton and Taupin's autobiographical album about their own partnership, is about the very strangeness of their method. It was the first album in chart history to enter the Billboard 200 at No. 1 in its first week of release. Joel's "The Stranger," two years later, was Phil Ramone's production and Joel's complete songwriting vision, and it still sounds like a record made by someone who needed to prove something. Both albums are correct. The piano is just where they started.