Murray, Murray, Murray,
      I'm not that clever. Here's a snippet from Wikipedia's article on Cashbox magazine. Wikipedia isn't Brittannica (I've corrected some things on Wikipedia meself), but this article is accurate, to the best of my knowledge:


Separate charts were presented for juke box popularity, record sales and radio airplay, similar to Billboard's methodology prior to August 1958, when it debuted its Hot 100, which attempted to combine all measures of popularity into one all-encompassing chart. In addition, chart data were presented for specific genres such as country music.