Radio Concierto was born in late 1970 as a classical music radio on FM (thus the name), related to the AM radio station Bulnes. Due the poor interest the owner given to the station, plus the experimental nature of the FM back then, no formal logo existed on this brieft era.
On August 1972, after being adquired by Julián-García Reyes Anguita, the station was relaunched, now as a top 40/hits music radio station.
In 1975, Radio Concierto launched stereophonic broadcasting, and, in order to reflect the technological advantage achieved, the radio starting to name itself Gran Concierto Stereo, leaving Radio Concierto naming with less protagonism, but used as well.
Alternative logo with the then-secondary naming, used mainly on vinyl covers.