The history of the singles chart idea
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Ranking songs by their popularity gave the music industry, and its audiences alike, a shared, ongoing way of tracking what was resonating most widely with listeners at any particular given moment in time across the wider market, a curiosity that predates any of the specific tools eventually built to satisfy it.
This idea of a chart shaped songwriting and release strategy considerably, encouraging artists and labels alike to think carefully about how a given song might perform against its immediate competition within an often fairly crowded field of releases, a pressure that shaped how songs were written as much as how they were sold.
Even as measurement methods themselves have changed dramatically over time, the underlying appeal of tracking popularity has persisted regardless, reflecting a lasting curiosity about what large numbers of other listeners happen to be choosing to hear, a curiosity that seems unlikely to fade regardless of how it is eventually measured.