 The previous year, 94.9 WINZ-FM (now WZTU) had changed from a rock format to Top 40, leaving Miami with no AOR station (WSHE was a Rock 40 station at this point in its history, and very highly rated, while eschewing Classic Rock and older songs).So Cox decided to go after that unserved youthful audience.The station called itself "97 GTR" with the call letters standing for GuiTaR.