This show was broadcast with mono sound, as stereo wouldn't be available in Spanish television for a few years yet. However, viewers were encouraged to tune a radio device into RTVE'S radio channels, where the whole audio of each episode would be broadcast in stereo, allowing for the viewing of the show hearing songs in stereo by putting the radio next to the TV and muting the TV sound. This was a common practice on TVE in the 1980's, until proper stereo TV broadcasts began by mid 1990's in Spain.
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