Barcelona (Freddie Mercury and Montserrat Caballé song) Mercury for the task. Caballé became enthusiastic about the project and instead of recording a single, she proposed to make an album, on which Mercury agreed. The song "Barcelona" had to be its opening song, to be completed by 1988, and to be submitted as a candidate for the 1992 Olympic theme (the selection was scheduled for 1988, four years before the Games). The recording was complicated by Caballé's tight schedule. Thus to spare her time, Mercury recorded the song, singing Caballé's part in falsetto. He would then send a tape to Caballé to prepare her for the joint studio
Mercury battery popular power source for portable electronic devices. Due to the content of toxic mercury and environmental concerns about its disposal, the sale of mercury batteries is now banned in many countries. Both ANSI and IEC have withdrawn their standards for mercury batteries. The mercury oxide-zinc battery system was known more than 100 years ago but did not become widely used until 1942, when Samuel Ruben developed a balanced mercury cell which was useful for military applications such as metal detectors, munitions, and walkie-talkies. The battery system had the advantages of long shelf life (to 10 years) and steady voltage output.