 It became a Top 40 station for a short time in the early 1970s under the call letters KFMX.Then it switched back to easy listening music, and, in 1973, changed its call letters to KEZO, standing for EaZy Omaha.The station flipped to rock music at 9 a.m. on September 6, 1978, still keeping its KEZO call letters but using the identification Z-92.