DZAK-FM

DZAK-FM (91.1 FM), broadcasting as Rock 91.1, is a music FM radio station owned and operated by ViacomCBS Networks Philippines. The station's studios are located at GS Media Tower, Corner of Urban Avenue &, San Lorenzo, ; while it's transmitter is located at GSTV SuperTower, Hippodromo, Carmona, Makati City, sharing the site with sister stations DWGS-FM (O-Chan 108.5), DZGX-AM (GS News Station 999), and DZKN-FM ( 105.5).

DZAK-FM is the most-listened-to hard rock station in and is popular with teenagers and young adults, as well as American, British and Canadian expatriates.