In 1987, Caballé made a rare excursion into the world of pop music when she released a duet with Freddie Mercury, the lead singer of the rock band Queen, which was titled "Barcelona". The song was inspired by Caballé's home city and later used as one of the two official theme songs for the 1992 Olympic Games. Mercury was a great admirer of Caballé, considering her voice to be "the best in the world". The single was followed by an album of the same name which was released the following year and featured further collaborations between the two performers. The title track later became the anthem of the 1992 Summer Olympics which was hosted by Caballé's native city, and appeared again in the pop music charts throughout Europe. Caballé also performed the song live, accompanied by a recording by Mercury, who had died in 1991, before the 1999 UEFA Champions League football final in Barcelona's Camp Nou stadium.