Johnny Morgan said:I think WHOT AM/FM-Youngstown has KDWB beat by 4 years. According to this history (http://www.nrcdxas.org/articles/whot.txt), WHOT was Top 40 as early as 1955, on a daytime facility at 1570 (later 1330, and 101.1 FM). That would put Myron Jones near the front of the pack, along with Todd Storz and Gordon McLendon as pioneers in Top 40 radio.
It's still around, 51 years later, with a direct lineage back. In fact, Jones owned the stations until the mid-90s.
Storz was three years earlier with his conversion of KOWH... http://www.davidgleason.com/KOWH_Birth_of_Top-40.htm shows an ad for KOWH in the year after it became the first of its type. Storz' PD, Bill Stewart, went on to help McLendon convert KLIF.