Houston was a supporter of Nelson Mandela and the anti-apartheid movement . During her modeling days , she refused to work with agencies who did business with the then-apartheid South Africa . On June 11 , 1988 , during the European leg of her tour , Houston joined other musicians to perform a set at Wembley Stadium in London to celebrate a then-imprisoned Nelson Mandela 's 70th birthday . Over 72,000 people attended Wembley Stadium , and over a billion people tuned in worldwide as the rock concert raised over $ 1 million for charities while bringing awareness to apartheid . Houston then flew back to the US for a concert at Madison Square Garden in New York City in August . The show was a benefit concert that raised a quarter of a million dollars for the United Negro College Fund . In the same year , she recorded a song for NBC 's coverage of the 1988 Summer Olympics , " One Moment in Time " , which became a Top 5 hit in the US , while reaching number one in the UK and Germany . With her world tour continuing overseas , Houston was still one of the top 20 highest-earning entertainers for 1987 – 88 according to '' Forbes '' magazine
Nelson Mandela 's 70th birthday
Nelson Mandela 70th Birthday Tribute
Whitney Houston