The company suspended operations in 1978, by which time AT40's production company, Watermark Inc., had contracted with JAM Creative Productions, also out of Dallas, for their show jingles and themes.
was a radio syndication company that was founded in 1969 by Tom Rounds and Ron Jacobs.
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The company also produced the "Cruisin'" series of albums, recreating top 40 disk jockey shows of the 50s and 60s and released on Increase Records (which at the time was a unit of Watermark), and Jack S. Margolis' comedy album, A Child's Garden of Grass, for Elektra Records.
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Watermark also syndicated other shows including The Robert W. Morgan Special of the Week, Alien Worlds, Soundtrack of the 60's (hosted by "Murray the K" from 1980 to 1981, and Gary Owens to series end), Profiles in Rock (hosted by Terry McGovern), Ringo's Yellow Submarine, and The Elvis Presley Story, as well as occasional specials.
Based on the success of American Top 40, Casey Kasem and Don Bustany, together with Tom Rounds of Watermark, created a country version of the top 40 program called American Country Countdown.