Ever wonder what song was the most popular on the day you were born? What your parents were dancing to just before you decided to appear? What tune the nurses hummed while you were being bathed for the first time? Here's a place to find the #1 Billboard song on any given day in any year back to 1890 when Billboard was, uh, written on stone tablets? Actually, any pre-1940 tunes were taken from the book Pop Memories 1890-1954: The History of American Popular Music. The Mudd's reference collection has Joel Whitburn Presents a Century of Pop Music: A Year-By-Year Top 40 Rankings of the Songs & Artists That Shaped a Century, stretching from 1900-1999.