The complete set of charts contains 500,331 items (most combining many weekly entries) that came from 230 charts each gathered by a different group of people. There are bound to be places where names have been misspelt, artists have been wrongly combined or entries missed out. If you think you have seen such a case contact us.
Two songs seem to have the same position
When a single is listed as a double 'A' side then, for the purposes of this analysis, the two songs are both independently treated as achieving that position. In this case two different songs can both have entries, for example, stating that they are "Germany 6 of 1978".
The same song has different names
Typically the 230 source charts don't ever use exactly the same name for a song title, album name or artist name. The consolidation process attempts to bring these entries together, but it is hard to find all the changes needed, as a result some titles that to a person are clearly the same (like "Dream Number Nine" and "Dream No. 9") will be listed as distinct songs. Normally this is a mistake and should be fixed in a future version (if you see an example please tell us about it).
The artist name is wrong
In order to bring together as many entries as possible the names of the artists have been made more consistent between the 230 source charts. Clearly "Elvis Costello", "Elvis Costello & the Attractions" and "The Attractions" are three different combinations of musicians, however calling them all "Elvis Costello" makes it easier to see connections so that's what we do. Two song entries wrongly listed with the same artist could be explained by this merging (or it could just be a mistake).
If two entries are listed as having different artists which actually should match then tell us about it and we will fix the mistake.
One recent comment said that it was not worth creating this type of site unless every single mistake was removed. If we had taken that view this site could never have been created. As Albert Einstein said "Anyone who has never made a mistake has never made anything".