It is the Baton Rouge affiliate for: The Kidd Kraddick Morning Show; On Air with Ryan Seacrest; and American Top 40.

On October 31, 1940, the Federal Communications Commission (FCC) awarded the first fifteen construction permits for commercial FM stations, including one to the Baton Rouge Broadcasting Company.

[4] On May 6, 1941, W45BR was one of three newspaper-affiliated stations given provisional permission, pending the outcome of the newspaper ownership review, to begin operations.

In 1974, WJBO-FM switched its call sign to WFMF and shifted to a personality driven full-service Top 40 format under Program Director Randy Rice and became one of the most successful FM-Top 40/CHR stations in the United States (Arbitron Ratings market share).

Throughout its history as a Top 40, the station had shifted its musical directions, to Rhythmic, Adult-leaning and Alternative, but in each case returned to a mainstream playlist.

The change turned out to be a ratings disaster and after lasting only half a year as a Modern AC, WLSS went back to Top 40 in February 1997, using the name "Loose 102-5" at first.