On May 13, 2019, WMSO changed its format from southern gospel to urban oldies, branded as "Memphis Soul 104.1".[3]
On June 8, 2020, WMSO changed its format from urban oldies to classic hip hop, branded as "Bumpin 104.1".[4]
On November 13, 2023, WMSO changed its format from urban adult contemporary and gospel to Regional Mexican, branded as "El Gallo 104.1".[5]
On June 1, 2024, WMSO changed its format from Regional Mexican to urban adult contemporary, branded as "Power 104.1 The Source".[6]
FM translator
WMSO programming is relayed to an FM translator, which gives the listener the choice of FM with higher qualitystereophonic sound. The translator is owned by Arlington Broadcasting Company.