WWZZ/WWVZ were a pair of simulcasting radio stations in Washington, D.C., owned by Bonneville International. The station broadcast from Braddock Heights, Maryland at 103.9 MHz FM and from Waldorf, Maryland, at 104.1 MHz FM. It was commonly known as Z104 with the slogan "Washington's Modern Music." The station was also known for its community efforts and donation drives for local charities. Furthermore, as a member of the Nationals Network, it offered radio coverage of a large portion of the Washington Nationals games.
The WWZZ/WWVZ simulcast was originally two separately owned and operated stations, starting with WXTR ("Xtra 104"), then Washington's heritage Oldies station. WXTR, which had been purchased by Liberty Broadcasting, was soon paired with the Frederick, Maryland-licensed WZYQ 103.9-FM, the original "Z104", which had been doing a locally based CHR format in Frederick for years, in an attempt to attain better signal coverage for WXTR. From that point on, both stations operated as a simulcast throughout a variety of formats: first oldies, then all-seventies. Finally, Bonneville purchased the WXTR/WZYQ combo, and changed the format over to CHR at 11 AM on July 11, 1996, as "Z104" with the call letters WWZZ/WWVZ. The first song on "Z104" was "Get Ready for This" by 2 Unlimited.