Re: Billboard: Hot 100 Turns 60
If I'm not mistaken, criteria used is by the Billboard singles charts which take into account singles sales as well as airplay. Lay Down Sally peaked at #3 in 1978. Layla only peaked at #10 in 1972. Obviously over time, Layla has gotten more airplay than Lay Down Sally. In the 60s[ probably top 40 at it's peak interest} songs raced up and down the top 40. By the late 70s and especially later, songs lingered on the charts for longer periods of time, picking up more Billboard chart points. This was of no help to the Beach Boys, Creedence and Guess Who.
On Aug. 4, 1958, Billboard launched the Hot 100, forever changing pop music -- or at least how it's measured. Sixty years later, the chart remains the gold-standard ranking of America's top songs each week. And while what goes into a hit has changed (bye bye, jukebox play; hello, streaming!), attaining a spot on the list -- or better yet, a coveted No. 1 -- is still the benchmark to which artists aspire, from Ricky Nelson on the first to Drake on the latest. Which brings us to this hottest-of-the-hot list: the 600 most massive smashes over the chart's six decades. https://www.billboard.com/charts/hot-100-60th-anniversary