Well you're smart to do that , because since the Top 40 was a conglomeration of several music types obviously only some of them will be able to cross over, not every soul song , every disco song , every country song , MOR, jazz , etc.. , even some of the big titles from them , is going to be able to obtain space in a collected Top 40 trying to identify itself as 'pop'.
Certainly in the case of disco, some of the very best songs , number ones even on that chart , were not able to jump over into Top 40 and they will therefore forever be secret to the masses. That's one reason disco as a specific radio format erupted in 1979, because much of the music wasn't being heard otherwise.
But conversely there is certainly lots of music that was limited to the Hot 100/ Top 40 that was not on any other chart, so I wouldn't dismiss it as a resource entirely, which I know you aren't saying.
Yes Rick James was a glaring example of an artist that got the short end of the deal in that process. Well be glad you weren't in the UK then, where chart-wise they next to didn't know James existed!
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