With all due respect, the Indianapolis market never saw anything like the pitched battle between WAKY-AM and WKLO-AM in Louisville from 1958-1983, with R&B daytimer WLOU-AM joining in, skewing WAKY and WKLO playlists more towards R&B/Soul ttham most Top 40 lists. In fact, Bartholomew County was in the Louisville ADI then, with significant listening to the Louisville stations in what are now the southern counties of the Indianapolis ADI...WAKY even hit the book in Vigo County (Terre Haute) during daytime power and pattern!
That war was all-out, with excellent programming, production, and personalities. PAMS (WAKY/WKLO) and Pepper-Tanner (WLOU) made a mint on jingles for these stations! It was once said that, at the height of this war, that a spot on any one of the three stations' surveys influenced stations from Fort Wayne to Atlanta.
A friend of mine, a former engineer from WLS-AM in Chicago, said that the Louisville stations' playlists were must-read material there by programmers at WCFL, WLS and WVON, seen as a "fail-safe" list for breaking music in the Southeast.