This meant that an artist would have a completely different track record on Kasem's show than what's in Billboard's archives. Likewise, several songs that made it onto the Hot 100, but not into its Top 40 were included on the Radio and Records chart. That meant that songs that were huge, inescapable radio hits that were deemed ineligible to chart on the Hot 100 due to rules on physical single release made it onto Casey's chart.

Chart Displacement: Happened quite a bit in the 1990s, because Casey's Top 40 used the Radio and Records CHR Top 40 chart instead of the Billboard Hot 100, and he kept using it when he returned to American Top 40.

That final 1988 show included a song by The Moody Blues in the top 40 ('I Know You're Out There Somewhere', which also stayed put for the first Shadoe Stevens-hosted program), as did the Jdebut show ('Question').

(Both songs hit #1 on both Billboard and R&R.) The final Casey Kasem-hosted show of the original American Top 40 (August 6, 1988) featured the teenage pop star at #40 on the Billboard chart, falling nine notches with her former #1, 'Foolish Beat.' The first installment of Casey's Top 40, aired the weekend of January 21, 1989, featured another Gibson song in the #40 position: 'Lost in Your Eyes,' which debuted at #40 on the Radio and Records chart and would hit #1 six weeks later.

A variation applies regarding Debbie Gibson.

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