sentences:  The average cost for the Summer Olympics since 1960 is US$5.2 billion, with an average cost overrun of 176%.There were two main musical themes for the 1992 Games.The first one was "Barcelona", a classical crossover song composed five years earlier by Freddie Mercury and Mike Moran; Mercury was an admirer of lyric soprano Montserrat Caballé, both recorded the official theme as a duet.