Olivia Newton-John And Andy Gibb [Getty Images]

Singers Olivia Newton-John and Andy Gibb (1958 - 1988), at 'The Music for UNICEF Concert: A Gift of Song' benefit concert held at the United Nations General Assembly in New York City, 9th January 1979. The pair sang a duet 'Rest Your Love On Me'. (Photo by Michael Putland/Getty Images)

Hulton Archive Michael Putland