Every week, a single chart claims to sum up the most popular song in America. But "popular" has never meant one simple thing, and the exact recipe behind the Hot 100 has shifted more than most casual listeners realize.
In the chart's early years, the formula leaned heavily on two inputs: physical single sales and radio airplay, each tracked separately and then blended into one ranking. That made sense in an era when buying a 45 and hearing a song on the radio were the two dominant ways people experienced music. A song could rocket up the chart on sales alone, even if radio programmers were slow to embrace it, or vice versa.
The 2000s forced a rethink. Digital downloads through services like iTunes introduced a new, easily countable sales metric, and the chart absorbed it quickly. The bigger disruption came with streaming. Once services like Spotify and Apple Music became the primary way people listen, Billboard had to decide how much weight an on-demand stream should carry compared to a traditional purchase. The current formula folds in on-demand audio and video streams alongside sales and radio airplay, with each component weighted to reflect actual listening behavior rather than treating every stream as equal to a single purchase.
Because the underlying formula has changed, comparing chart runs across eras is trickier than it looks. A song that spent six weeks at number one in 1961 was competing under sales-and-airplay rules; a song doing the same in 2019 was competing in a streaming-dominated landscape where a single blockbuster placement or viral moment can move millions of streams overnight. Neither era's number one is more or less "real" than the other, but the paths to the top look different, and that's worth keeping in mind when a list like this one lines up songs from 1958 next to songs from 2018.
The Hot 100 tracks popularity, not quality, and it was never designed to. A song can dominate the chart because it's genuinely beloved, because it's inescapable in commercials and playlists, or because a single high-profile placement drives a short-lived spike. That's part of why a community ratings approach can add something a chart can't: an actual answer, from real listeners, to a very different question than "how many people streamed this," namely "do people still want to hear it again."
Curious how these chart-topping songs actually hold up with listeners today? Browse the full Pick Your Notes shelf and rate them yourself.
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