WTSM is a radio station on 97.9 FM licensed to Woodville, Florida, United States, serving Tallahassee. It is owned by Radio Training Network, Inc., and broadcasts a Contemporary Christian format branded as "The Joy FM".

WJZT began broadcasting on September 7, 2003, a year after the station was granted a construction permit by the Federal Communications Commission. It originally aired a smooth jazz format and was owned by Kathy and Ernie Petrone. In 2006, WJZT Communications, LLC, a division of Horizon Broadcasting, acquired the station for $2.3 million.

After a brief stint as oldies "Cruisin' 97.9", WJZT flipped to sports on December 1, 2010, as "Tallahassee's Sports Monster", using ESPN Radio programming.

Horizon Broadcasting reached a deal to sell WTSM and WHLG in Port St. Lucie to Radio Training Network, which owns The Joy FM regional network of Christian radio stations, for $1.3 million in May 2021. The sale was consummated on August 31, 2021.

On September 1, 2021, WTSM changed their format from sports to contemporary Christian, branded as "The Joy FM".