The start of the Hot 100 in 1958 was actually a smaller historical event than most people realize, or even know about.
The shift to the Top 100 starting in 1955 was much bigger, and was the first combo of (only) the Best Sellers chart, the DJ Airplay Chart, and the Juke Box chart. From 1955 to 1958, Billboard was constantly tweaking the Top 100, for a while removing the Juke Box chart, and then the DJ Airplay chart, bouncing around so that by the end it was basically now more record sales oriented.
But then with the Hot 100, they reverted back to the original vision of the Top 100 !! Again combining those same 3 charts, even if some of them were no longer published weekly.
Either way you slice it, a chart with 100 positions was the big news overall.
But probably the biggest secret of Billboard combo charts was the Honor Roll of Hits chart, which ran from 1945 to 1963. At one point in time, Billboard considered this their granddaddy chart, as it combined the 3 charts above with sheet music sales, and songs played in movies and TV programs, thru some magic formula. Only a Top 30 chart though...
And that's the way it was. Class dis--missed...
