Princess Irene of Greece, sister to King Constantine, practicing the piano for a concert at the Festival Hall in London on 16th June 1969. (Photo by Ray Bellisario/Popperfoto via Getty Images/Getty Images)
Princess Irene of Greece, sister to King Constantine, practicing the piano for a concert at the Festival Hall in London on 16th June 1969. (Photo by Ray Bellisario/Popperfoto via Getty Images/Getty Images)