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 (This is Not an official site, the official site is at40.com) AT20 AC chart change of 2003 With the February 8, 2003 show, the AC version of American Top 20 changed charts. Instead of using Radio & Records' AC chart, AT20 AC now uses an unpublished Mediabase AC chart. The new chart is different than the R&R chart in the following ways: 1) Songs played on the syndicated daily "Delilah" show are not counted toward the chart, and 2) The chart is ranked based on audience impressions rather than just how many times a song is played. No information is available for the recurrent rules of the new chart. This information came from a staff member of AT20 and is listed here with permission. With the November 2nd 2001 issue, Radio & Records changed its recurrent rule again. For the CHR/Pop chart, which AT40 currently follows, the recurrent rule reverts back to 20 weeks on and below #20. This is the same rule that R&R used before its charts changed back in August. For the AT20 shows, the recurrent rule changed to 20 weeks on and below #15. This is a new rule for these charts. For a history of the chart saga and some differences between R&R & AT40 during the separation, see below. AT40 chart change from 10/21/2000 through 8/10/2001 Casey Kasem and his staff used R&R for the source of their charts from January 1989 to October 14, 2000. On October 21, 2000, AT40 switched from R&R to a chart provided by Mediabase 24/7. The Mediabase 24/7 chart appeared to have no coherent recurrent rule, and songs were removed from the chart from as high as #10. AT40 said that their new chart was better than R&R's, and that the new chart would provide a "fresher" sound since the chart supposedly moved faster. R&R staff have said that AT40 actually changed charts because Mediabase charts were available to AT40 a few days earlier, giving AT40 writers more time to prepare the show. On August 10, 2001, R&R changed its charts to Mediabase only data as well as its recurrent rule. With the chart change, the chart is now available a few days earlier, and thus AT40 decided to go back to the chart. The 1st AT40 show that used AT40's new chart was August 18, 2001. Here is a summary of some of the differences between R&R and AT40 during the separation: Seven songs were on AT40 but never made R&R's Top 40:
63% of all songs that debuted during the separation debuted first on AT40, then on R&R at least 1 week later. The longest wait between a song debuting on AT40 and then R&R was 5 weeks, by American Hi-Fi's "Flavor of the Weak". 58% of all songs that fell off AT40 during the separation fell off earlier on AT40 than on R&R. In terms of #1 songs: "Again" by Lenny Kravitz reached #1 on R&R but not on AT40, and "Survivor" by Destiny's Child reached #1 on AT40 but not R&R. Many thanks to GordonUM from the R&R Messagebords for compiling the above chart information.
This information was last updated February 13, 2003.
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