1970s #1 Billboard singles part 1 of 2

These are getting too long. I had trouble playing the 1960s video on my phone today. I was thinking that I can make them two or three parts for each remaining decade going forward.

Backward 1930s, 1920s, 1910s, and 1909 to 1898? top 100 songs. That is 400 songs on the backward of the timeline.