The once-dominant reality TV show started to diminish after its eighth season, focusing on a narrower and narrower band of pop music: “WGWG,” or “white guys with guitars.”

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The symptoms were all there for “American Idol” — falling ratings, high talent costs, advertiser defections. Few were surprised when Fox executives announced Monday that the show’s upcoming 15th season would be its last.

What’s perhaps less obvious is that the one-time ratings juggernaut lost its way several years ago, when it moved away from the pulse of pop in its broadest and most inclusive sense. It became less relevant to the overall musical conversation — a smaller and smaller echo chamber reverberating with outmoded ideas.

Or as its detractors put it on Twitter, it became just another forum for WGWG — white guys with guitars. The show was hugely popular in the South and increasingly seemed to reflect those regional loyalties.

In its heyday, “Idol” served as a latter-day version of 1960s AM radio, with more stylistic and demographic diversity than network music programming typically offered. Everyone in the show’s audience had a rooting interest, and because the show depended on its viewers to steer the competition, it created the impression that, week to week, something pivotal was on the line — and it required your participation.

The Season 8 finale would have been a good one to end on. That’s when Adam Lambert, the peacocking glam-rock phenom, was up against Kris Allen, a milquetoast folkie.

Picking a side felt important, like a battle in a broader culture war. It reflected something about your identity, or at least about your idea of what you wanted music to represent: adventure vs. safety. Innovation vs. re-creation. The future vs. the status quo.

Popular music had always been a forum for such disagreement, but “American Idol” turned the conflict into a televised spectator sport.

It was the show’s pop sensibility, along with its freshness and originality, that made it a hit from the beginning, way back in 2002. “Idol” was the No. 1 show on TV for a record eight seasons, with its Tuesday performance episodes averaging more than 31 million viewers in 2006.

Along the way, it changed both TV and music. Other networks raced to get competitive reality shows (“Dancing with the Stars,” “Rising Star”) on the air, and suddenly aspiring performers had a way to find fame and fortune without record companies in those pre-YouTube dark ages.

Most visibly, it made fresh superstars out of Kelly Clarkson, who came in first on “Idol’s” inaugural edition, and Season 4 champ Carrie Underwood. Today, both are still A-list acts, with numerous Grammy Awards, hit singles and platinum albums between them.

The show also helped change the way those superstars do business by heavily promoting the sale of digital downloads (specifically through Apple’s iTunes Store) at a moment when illegal piracy was ravaging the record industry’s original profit centers.

“American Idol” affected pop more subtly, too. A contest decided in part by viewers, the show encouraged an emotional investment among fans that foreshadowed the rise of social media, where artists are accountable to their followings in ways their predecessors could scarcely have imagined. Singers like Lady Gaga and Katy Perry have capitalized on that sense of ownership to build so-called “fandoms” of ultra-devoted enthusiasts.

But following Allen’s pivotal win over Lambert in Season 8, “Idol” went on to anoint a series of increasingly bland Everymen — Lee DeWyze and Phillip Phillips among them — that suggested the show had fallen out of touch with pop’s variety.

Last year’s winner, Caleb Johnson — that’s his name, right? — seemed totally adrift as an artist, mere chum used to attract viewers (and advertisers) to a TV show whose dramatic stakes never felt lower. Why bother getting invested if the program wasn’t going to match your devotion?

As the show aged, “American Idol” also erred by showcasing its judges at the expense of its contestants, becoming like a football game in which the coaches outshine the players.

In the days of the show’s founding panel — with Paula Abdul, Randy Jackson and Simon Cowell, the last of whom helped bring “Idol” to America from Britain — the experts appeared genuinely dedicated to steering the young hopefuls placed before them.

Sure, Cowell could be nasty, but he always had a point. More importantly, he was assessing performances by the demanding standards of Top 40 radio, not the closed-off ecosystem of the show itself. When he left in 2010, followed eventually by Abdul and Jackson, “Idol” lost much of its pop savvy, which producers tried to replace by hiring actual pop stars, including the show’s current troika of Jennifer Lopez, Keith Urban and Harry Connick Jr.

Yet these three seem in it primarily for themselves, a problem less on moral grounds than because it simply diminishes the difference between “American Idol” and the other star-studded singing shows it spawned (like NBC’s currently more successful “The Voice”).

Still, as we prepare to say goodbye to this giant of American entertainment — a farewell you can bet host Ryan Seacrest will milk for maximum sentiment during its final season — it’s easy to imagine missing the excitement “American Idol” used to generate at its peak.

Back then, you tuned in to watch pop cultural transition in action, be it an unknown singer figuring out how to capture and hold the attention of an audience or a music industry clinging desperately to a television-born source of revival.

Fighting about music won’t be the same once it’s gone.