This is the first public performance of Barcelona by Freddie Mercury and Montserrat Cabballé ( Tony Pike will dispute this, maintaining that it was performed at Pikes Hotel first).
Mercury was a huge fan of Cabballe and waited years before he had the right song to perform with her. Barcelona was that song, written as the Theme music for the Barcelona Olympic games in 1992.
Ibiza and Ku nightclub was the venue for a huge 3 day party that celebrated the announcement of Barcelona as the Olympic venue for 1992. Anybody that was famous was on the Island for THE Party!