Her first song "Those were the days" became one of the biggest hits of the year and the decade. It may have been the first Apple Records' single to chart in the US.
Her second single was a Paul McCartney tune called "Goodbye".
Mary Hopkin had a very brief career. I loved her voice and style.
Where is Mary Hopkin now? I don't know. I hope that she is doing well and in good health.
P.S. You can listen to my show (Canto Talk) and follow me on Twitter. Mary was at the very beginning of what came to be known as Apple Records: