American Top 40 History

Classic AT40 with Casey Kasem: July 4, 1970 through August 6, 1988

"American Top 40" debuted the weekend of July 4, 1970. The concept of playing the 40 most popular songs from a national chart was a new one, and no one was sure of the success of the show at the time. Listeners first heard Casey Kasem count 'em down on station KDEO in El Cajon/San Diego, California at 7 pm on Friday, July 3, 1970. KDEO was one of just a few stations across the USA to air the show on its 1st weekend. Throughout the 1970s, and into the 1980s the show's popularity increased. One of the ways this happened was that the owners of the show would send "demo reels" to radio stations to get them to sign on to the show. By the early 1980's the show was heard on over 500 radio stations in the USA alone.

Casey counted down the 40 biggest hits off of Billboard's Hot 100 Singles chart. Originally a 3 hour program, AT40 expanded to the now familiar 4 hour length in 1978. Besides the top 40, AT40 played Long Distance Dedications and extras. The first Long Distance Dedication, "Desiree" by Neil Diamond, aired in 1978. Fans could also write in questions and have the AT40 staff answer them, sometimes on the air.

In the spring of 1979, AT40 published its first book, "Casey Kasem's Top 40 Yearbook". This book covered every song that hit the Top 40 from late 1977 to late 1978. Also included in the book were biographies and pictures of the artists who charted. Today the book is a collectible since another yearbook was never produced.

Special countdowns aired occasionally through the 1970s and 80s. Year-end countdowns, Christmas countdowns, and AT40 Book of Record shows are just a few of the many popular specials aired.

Trouble for AT40 began in 1988. Due to contract concerns, Casey Kasem left the show. Casey's last show aired August 6, 1988. Many radio stations and fans were upset. Casey joined the Westwood One radio network and created Casey's Top 40. As a replacement for Casey, ABC Radio Networks hired Shadoe Stevens.

Classic AT40 with Shadoe Stevens: August 13, 1988 through January 28, 1995

On August 13, 1988, Shadoe Stevens became the new host of AT40. Shadoe began the show by doing a "theater of the mind.":

Shadoe walked through an AT40 museum of sorts, describing the show's history along the way. Near the end of the tour, Shadoe saw a gold statue of Casey Kasem. The tour ended when Shadoe reached the studios where AT40 was recorded, and then the show's regular theme began.

The content of AT40 with Shadoe as host remained basically the same, but some changes would occur during the next few years. New features that debuted on Shadoe's watch included Flashbacks, where Shadoe would play clips of the top 5 from a past show, AT40 Music News, and AT40 Sneek Peek (sic), where Shadoe would play the song added to most radio stations that week.

Many of the radio stations upset by Casey's departure dropped AT40 in early 1989 when Casey's new show, "Casey's Top 40" debuted. Another blow to AT40 occurred during the early 1990s, when major changes to the Top 40 format took place. Top 40 stations splintered into subformats, including Top 40/Mainstream, Top 40/Adult, and Top 40/Rhythm. Rap and Grunge became quite popular as well. At the same time, Billboard decided to change the way it tabulated the Hot 100. Billboard was now able to track how many copies of a single was sold as well as how many times a song was played on radio stations. On November 30, 1991, the new Hot 100 debuted. Due to the methodology change, more rap and other nontraditional Top 40 music now appeared in the top 40 positions of that chart.

In order to keep a similar pop sound, AT40 switched to an airplay-only chart, the Top 40 Radio Monitor, on November 30, 1991. However, this chart also included the nontraditional Top 40 music. Radio stations continued to drop AT40 and switch to Casey's Top 40 and Rick Dees Weekly Top 40. (Casey's Top 40 was hosted by Casey Kasem and used the Radio and Records Top 40 pop chart, which was an airplay chart.) After 1992, AT40 switched charts again, to the Top 40/Mainstream chart, also an airplay only chart. AT40 used this chart until the end of its run.

Also during this time, AT40 also tried to become more "hip" sounding and changed its jingles and theme. In the last week of June 1992, Shadoe announced some changes would occur next week. On July 5, 1992, the show's 22nd Anniversary, AT40 began with its new theme. Here is a memo describing the change to radio station program directors. However, all of this was not enough. AT40 was no longer heard in the USA after the summer 1994 (view a Billboard article announcing the change), and ended its run on January 28, 1995 (another Billboard article announcing the end of AT40).

A few specials aired during Shadoe's reign, including among others "The World Tour", "Book of Records 80s Edition", and "All-American Fourth of July Special". When Shadoe took vacations, guest hosts were either music stars such as Debbie Gibson or TV actors such as the late Jay Thomas.

From July 4, 1970 to January 28, 1995, 5363 songs made the top 40, and 552 songs hit Number One. The first Number One song was "Mama Told Me Not to Come" by Three Dog Night, and the final Number One was "On Bended Knee" by Boyz II Men. For examples of important charts in AT40's history, visit the chart information page.

AT40 with Casey Kasem: March 28, 1998 to January 3, 2004

At the end of March 1998, "American Top 40" was revived by AMFM networks, and the show was again hosted by Casey Kasem. In fact, there were now 3 versions of the show. Besides AT40, which was based on the Top 40/Mainstream format, there were 2 "American Top 20"s. One version was based on the Hot Adult Contemporary format (Hot AC), and the other was based on the Adult Contemporary format (AC). These shows used the R&R charts. (From October 2000 to August 2001, the shows used unpublished Mediabase 24/7 charts). American Top 20 AC became American Top 10 in 2004.

The format of AT40 was very similar to Classic AT40 under Casey's reign.

AT40 with Ryan Seacrest: January 10, 2004 -

In December of 2003, Premiere Radio Networks announced that radio and television personality Ryan Seacrest would take over AT40 in January 2004. AT40's format became more interactive, with listeners voting on their favorite song via the internet and e-mail to Ryan being read. In addition, stations could receive the show via the internet or satellite. Casey Kasem  continued to host American Top 20 and American Top 10 through July 4, 2009 (for more info on these shows, see the history page on the AT20 section of this site).

AT40 Flashback

Starting at the final weekend of 2000, classic AT40 shows were heard again. The 2nd half of the top 100 hits of 1985 was played on several stations, especially stations with a 1980's lean. Each week the show plays the final 3 hours of classic AT40 shows from the 1980s. The show ended its run in December 2002. For more information on the show, visit the Flashback page.

AT40 on Sirius-XM Satellite Radio

After a brief run on XM in 2003, AT40 returned to XM in August 2006. For the weekend of August 4, 2006, a marathon of shows was run on both the 1970s and 1980s channels. After the marathon, 1 show from each decade was run per week. Often, the shows are edited down, removing themes, jingles, and sometimes songs. Eventually after the Sirius-XM merger, the 1980s shows were no longer broadcast.

AT40: The 1970s and AT40: The 1980s

In late 2006, Premiere Radio Networks began producing a show similar to the old AT40 Flashback. Instead of the 1980s shows, entire 1970s shows were made available for radio stations to air. The only catch was that only 3 hour shows were available to air, meaning only shows before the 1978 switch to 4 hours are available. In 2012, 4 hour 1970s were made available to stations that wanted to air them. Many stations though still elected to only air the final 3 hours.

In April 2007, Premiere made 1980s shows available once again. The format is the same as the 1970s show above, and all 4 hours are available if wanted. More details about these shows can be found on this page.

Visit our tribute to the number one countdown show.

 More Information on Classic AT40

Casey Kasem retired from current countdowns as of the July 4, 2009 weekend, ending the American Top 10 and American Top 20 shows. Here are links to news stories about Casey's retirement:Casey kasem passed away in June 2014 at age 82. Links to articles on his life can be found on the tribute page.

A thorough history of AT40 can be found in Rob Durkee's book "American Top 40: The Countdown of the Century". As of this writing, the book is out of print.  Ebay sometimes has a copy for sale. Local libraries or used book stores might also have a copy.

For a detailed analysis of every AT40 show from the 1970s, be sure to check out Pete Battistini's book "American Top 40 with Casey Kasem (The 1970s)".  "American Top 40 with Casey Kasem (The 1980s)" by the same author is also available.