In June 1981, the station was known on-air as "FM 99 WXLO making its move to 98.7". By the middle of July, the station had changed its call letters to WRKS-FM (the meaning of which originally referred to its being an RKO Station) and adopted the on-air brand "98.7 Kiss FM", as the station's transition to this new urban contemporary format was completed by that August. Early on, WRKS played a great deal of R&B and dance music, and became an almost instant hit with listeners, as its ratings skyrocketed from 22nd place to third. Notable Kiss FM Mixmasters at the time Shep Pettibone and, later, Tony Humphries, were commissioned to create longer versions of current popular songs. Longtime urban contemporary leader WBLS was caught off-guard by the sudden rise of the new station, which represented its first direct competition in that format.