Endless such "one hit wonders" from that era.

What went wrong?

The most obvious thing is that the music industry has merged into 5 massive companies. Another possibility is that we're less creative because we're so busy being alone together. Which is to say we are more alone, and that in of itself is a big negative in making great music. But then furthermore we're less creative as we waste our lives on facebook, etc. A possibility rarely mentioned is that those analog synthesizers which they don't make anymore and it seems no one uses anymore not only made some essential difference in the music, but perhaps just went with vocals, etc better and/or possibly gave far superior inspiration. And then there's perhaps epigenetics. Children of the UK going through all those bombings during WWII, perhaps it turned some genes on in the next generation which was born in the late 50's or so. Probably not that one. Maybe the first two primarily.

Of course the idiocracy will tell you modern music is just as good.