Why was the theme sung at the opening of the 1992 Summer Olympics in Barcelona delivered in pre-recorded form?

Question

What Olympic anthem was played at the opening ceremony of the 1984 Summer Olympics as well as the closing ceremony of the 2010 Winter Olympics?

Answer 1

One of the singers died 8 months earlier
The performance was a duet, "Barcelona", sung by Freddie Mercury and Montserrat Caballé. Mercury died in November 1991. The duet had been recorded in 1987 as part of a collaboration between the two performers, and in anticipation of being considered for the Barcelona Olympics.