Why do songs move in the charts when new versions are released?

There is a continual effort to fix mismatches in the data. For example locating places where the same song or artist is listed under multiple different names. One user pointed out that "Riders in the Sky" and "Ghost Riders in the Sky" were actually the same song (for which thanks). The source charts were edited to ensure that the same name was used everywhere, when the next version was generated the song went from being at numbers 6 & 7 of 1949 to being the number 1 song of the year.

So the movement of songs and albums in the charts is often a valid result of improvements in the source data.

You may also notice some artists come and go as these type of corrections adjust their total scores.

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