RTBF - Classic 21 is a Belgian public radio station that is part of the RTBF (Radio-Télévision Belge de la Communauté Française) network. It primarily focuses on classic rock and pop music from the 1960s to the 1990s, catering to a francophone audience. The station was launched on March 1, 2004, to specialize in rock-oriented programming. Classic 21 also features cultural content, music news, and interviews with artists. It is widely regarded as a key station for classic rock enthusiasts in Belgium.