Laurel Canyon, the Troubadour, and Asylum Records were three separate things that solved the same problem from different angles, and the moment all three were operating at once, the dominant sound of early-1970s American pop was essentially inevitable. The geography gave the musicians proximity. The club gave them an audience and each other. The label gave them a commercial infrastructure that, unusually for its era, treated their instincts as assets rather than liabilities. Strip any one of those three out of the picture and the decade sounds different.

The canyon came first, and its appeal was almost embarrassingly practical. As Graham Nash described it, the neighborhood offered "a beautiful bubble of creativity and friendship and sunshine and sex and drugs and music." What he left out of that list was the rent. Laurel Canyon was cheaper than the fashionable Westside neighborhoods, close enough to the Sunset Strip to matter, and secluded enough to feel like a separate world. By the late 1960s, the eucalyptus-lined hillside had become home to David Crosby, Stephen Stills, Graham Nash, Joni Mitchell, and Brian Wilson, among others. Cass Elliot ran an open-door policy from her house that functioned as an informal booking agency for new arrivals. Joni Mitchell's home became a second hub. The unofficial social infrastructure of the scene was built entirely on who lived within walking distance of whom, and the music that came out of those casual encounters, the harmonies worked out on porches, the chord progressions traded over coffee, had a warmth and looseness that studio sessions alone could never have produced.

The Troubadour, down the hill on Santa Monica Boulevard in West Hollywood, was where that informal community met the industry. Doug Weston had opened the club in 1957 as a coffee house on La Cienega, moved it to its current address in 1961, and by the late 1960s it had become the most important small room in American music. James Taylor made his Los Angeles debut there in 1969. In November 1970, Taylor and Carole King first performed together on that stage, King playing piano as his opening act. During soundcheck, Taylor heard King run through a song she had written called "You've Got a Friend," and they decided to play it that night. When the two returned the following year for a two-week co-headlining run, "Fire and Rain" was at the top of the charts and Tapestry was on its way to becoming one of the best-selling albums ever made. On August 25, 1970, Neil Diamond walked onstage at the Troubadour to introduce a young British pianist named Elton John, who was making his American debut. Kris Kristofferson played the club opening for Linda Ronstadt. Don Henley and Glenn Frey met in the Troubadour's front bar. As Ronstadt later recalled, "The Troubadour was where everybody went to hang out and to be noticed. You wanted to make yourself known to the record community at large, you go to the Troubadour, play an open mic night." The club was not just a venue; it was the scene's central nervous system.

The label that formalized all of this came into existence almost by accident. David Geffen had been managing Joni Mitchell, Crosby, Stills and Nash, and Neil Young through a partnership with Elliot Roberts, and when he tried to get Jackson Browne a recording contract at every established label in town and failed, he founded Asylum Records in 1971 rather than give up on the artist. The name was chosen deliberately: it was meant to be a safe place for artists who could not get a deal anywhere else. Browne, who was living in a duplex in Los Angeles, asked Geffen to also sign the two musicians living upstairs from him, Glenn Frey and J.D. Souther, on the basis that they were too broke to pay rent. Geffen signed them both. He then assembled Don Henley, Randy Meisner, and Bernie Leadon around Frey, put them in a room together, and eventually recorded them as the Eagles, whose debut came out in 1972. In Asylum's first year, Geffen also brought Linda Ronstadt over from Capitol Records and Joni Mitchell from Reprise. The label's roster was, in effect, a map of the canyon and the Troubadour's front bar rendered in catalogue numbers. By 1974, when Geffen had sold Asylum to Warner Communications and the label had merged with Elektra, it was releasing Jackson Browne's "Late for the Sky" and watching the Eagles move toward the sleeker, more ambitious sound that would produce "Hotel California" in 1976. Linda Ronstadt's "Heart Like a Wheel," also from 1974, fused country-rock rootsiness with pop precision in exactly the way the scene had been rehearsing for years.

What made the triangle work as a system was that each element reinforced the others without controlling them. The canyon gave musicians the freedom to develop slowly, in private, without commercial pressure. The Troubadour gave them a public-facing test of what they had developed, a room where, as Taylor put it, "if you did well there people noticed it and the word got out." Asylum gave the best of what emerged from those two environments a commercial home that was structured, unusually, around the artists' own judgment. Geffen offered greater creative control and more equitable profit sharing than the major labels of the era, which meant that the musicians who signed with him had every incentive to keep making records that sounded like themselves. The result was a body of work, across Browne, Mitchell, Ronstadt, the Eagles, and the wider circle of players who moved between their sessions, that had a coherence without ever being uniform. The same musicians kept turning up in different configurations: Russ Kunkel, Danny Kortchmar, and Lee Sklar played behind both King and Taylor at the Troubadour in 1970 and were still together as a rhythm section years later. The scene produced its sound through repetition and trust, not through any single producer's blueprint.

The incubation period for all of this is easy to overlook in retrospect, because the success that followed was so total. But in 1968 and 1969, before Asylum existed, before Tapestry had sold a single copy, before the Eagles had a name, the canyon was just a neighborhood where rents were low and Cass Elliot threw good parties. The Troubadour was a small club with a serious stage and a bar where people talked. The music that would define the decade was being written in rooms that nobody was paying attention to yet, by people who were mostly broke, trading songs with whoever happened to live upstairs. The system assembled itself from the bottom up, and by the time the industry noticed what had happened, the records were already made.