If you do a similar project for the fifties, you might have to use a different methodology because the Billboard Hot 100 didn't start until 1955.
However, they had been tracking singles by sales and airplay etc before then. So, there are records of what the top 10+ were back into the ‘40s. Very cool.
Even if I couldn't access BB data, perhaps we'd seqway into CashBox or Hit Parade.