"AM Only" was created by Transtar Radio Networks at a time when FM had overtaken AM for listeners seeking music on the radio. Most AM stations that had previously programmed formats such as Top 40, adult contemporary and country music saw their listeners switch to FM stations. These stations were in search of a format for mature listeners who were content with hearing music on AM radio, especially if the station played songs that FM stations thought was too old or conservative. "AM Only" was promoted exclusively to AM stations, though it was not long before some FM stations used it as well. The format was promoted on-air as "Great Songs, Great Memories," and it continues to use that slogan to this day. One affiliate used an ad which stated:
After a February 1987 debut with Chick Watkins as program director, "AM Only" had 157 network affiliates by the end of 1993. Growth of the format was helped by new material from Frank Sinatra and Johnny Mathis, and artists such as Harry Connick Jr., along with movies such as Sleepless in Seattle. KJUL jumped to number 3 in the Las Vegas market, and KOY became the number 5 station in Phoenix, Arizona. In 2000, over 240 radio stations used the adult standards format which was being distributed by this time by Westwood One. In the first decade of the 21st Century, the format added more uptempo material from the oldies and adult contemporary formats and promoted "A New Variety of America's Best Music". On October 1, 2008, America's Best Music absorbed Jones Standards, a short-lived format created by the now-dissolved Jones Radio Networks, as a result of Jones's purchase by Westwood One. Many, though not all, Jones Standards affiliates switched over to America's Best Music. Westwood One's subsequent purchase of Waitt Radio Networks added a second adult standards/MOR-based format to the syndicator's portfolio in the form of "The Lounge", formerly distributed by Waitt and now discontinued. In July 2015 it was announced that all the on-air personalities would be terminated as Westwood One downsized its air staff. Original morning show host Jeff Rollins and afternoon host and production director Carl Hampton were terminated as well as fellow weekday voice John Gleason, plus weekenders Pat McNulty, Wayne Yafee and Paul Worden. Rollins returned to the air, hosting mornings at WOSN, Ocean-FM, in Indian River Shores, Florida. Former DJs included Dick Heatherton, Nick Gerard, Ed Brand, Joe Daniels, Mark Haden, Rick Wagstaff, Rick Garza, Lou Simon, and Peter Doeblin. Chick Watkins, the format's former program director, was also a DJ for many years.
