Friend of OPC Gavin sends over a link to the hardy souls at Very Small Array, who have spent an inordinate amount of time recently sorting hit-record records into multicolored graphs. For me, the fascinating thing is trying to figure out what fits into the odd corners of the charts: What doo-wop hit went to Number One in 1978? "Kiss and Say Goodbye"? No, that was 1976. What Belgian song went to Number One in 1963? Wait, I know that one: "Dominique," by the Singing Nun.
They're using Cashbox, rather than the canonical Billboard rankings, so I can't look these things up. In a way, that makes it more fun.