The reassuring tones of Johnny Walker make BBC Radio 2’s Sounds of the Seventies programme an aural comfort blanket for those of a certain age. There is a reassurance that among some of the terrible recordings from that decade, and there was some really terrible stuff, there were tracks that have stood the test of time, records that are still aired more than forty years after they appeared in the charts.

Among the music that is still played, some is disconcerting, unsettling. Some revives a sense of the teenage insecurity …