This is what we found on Wikipedia regarding the Couplet Sessions in Riyadh:

Nouhad Wadie Haddad (born 20 November 1934 or 21 November 1935), known professionally as Fairuz, is a Lebanese singer. She is widely considered an iconic vocalist and one of the most celebrated singers in the Arab world, as well as a symbol of modern Lebanon. She is popularly known as "The Bird of the East", "The Cedar of Lebanon", "The Moon's Neighbor", "The Voice of Lebanon", and "Our Ambassador to the Stars", among others.

Fairuz began her musical career as a teenager at the national radio station in Lebanon in the late 1940s as a chorus member. Her first major hit, "Itab", was released in 1952 and made her an instant star in the Arab world. In the summer of 1957, Fairuz held her first live performance at the Baalbeck International Festival where she was awarded with the honour of "Cavalier", the highest medal for artistic achievement by Lebanese president Camille Chamoun. Fairuz's fame spread throughout the Arab world in the 1950s and 1960s, leading her to perform outside of Lebanon in various Arab capitals, including Damascus, Amman, Cairo, Rabat, Algiers, and Tunis.

Fairuz has received honours and distinctions in multiple countries, including Lebanon, Syria, Jordan, Palestine, Tunisia, the United States, Egypt, and France. Throughout her career, she headlined at the most important venues in the world, such as Albert Hall and Royal Festival Hall in London, Carnegie Hall, Lincoln Center and United Nations General Assembly Lobby in New York, the Olympia and Salle Pleyel in Paris, and the Odeon of Herodes Atticus in Athens.

In a career spanning over six decades, Fairuz has recorded nearly 1500 songs, released more than 80 albums, performed in 20 musicals, and sold over 150 million records worldwide, making her one of the highest selling Middle-Eastern artists of all time, and one of the best-selling music artists in the world.