Barcelona (Freddie Mercury and Montserrat Caballé song) with no orchestra. Barcelona (Freddie Mercury and Montserrat Caballé song) "Barcelona" is a single released by Queen vocalist Freddie Mercury and operatic soprano Montserrat Caballé. A part of their collaborative album "Barcelona", it also appeared on Queen's "Greatest Hits III". The song reflects Mercury's love of opera with his high notes and Caballé's operatic vocals, backed by a full orchestra. Originally released in 1987, it was one of the biggest hits of Mercury's solo career, reaching number eight in the UK Singles Chart. After Mercury's death in 1991, it was featured at the 1992 Summer Olympics, after which the track
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 Both ANSI and IEC have withdrawn their standards for mercury batteries.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.