Question: What great artist that Natalia Troitskaya sang with, did a duet with Freddie Mercury that became one of the two official theme songs for the 1992 Olympics?
Context: Freddie Mercury: The Great Pretender is an Emmy/Rose d'Or award winning 2012 feature-length documentary about Queen singer Freddie Mercury and his attempt to forge a solo career.  The documentary premiered on BBC One in edited form as part of the Imagine series, and later the Director's Cut was shown on BBC Four.  It gained 3.5 million viewers when aired on BBC One in October 2012 and a further 1.2 million when shown on BBC Four. The Freddie Mercury Tribute Concert for AIDS Awareness was a benefit concert held on Easter Monday, 20 April 1992 at Wembley Stadium in London, England for an audience of 72,000.  The concert was produced for television by Ray Burdis and broadcast live on television and radio to 76 countries around the world, with an audience of up to one billion.  The concert was a tribute to the life of Queen lead vocalist, Freddie Mercury, with proceeds going to AIDS research.  The show marked bassist John Deacon's final full-length concert with Queen (save a short live appearance with Brian May, Roger Taylor and Elton John in 1997).  The profits from the concert were used to launch The Mercury Phoenix Trust, an AIDS charity organisation. Montserrat Caballé (] ; born 12 April 1933) is a Spanish operatic soprano.  She has sung a wide variety of roles, but Caballé is best known as an exponent of the works of Verdi and of the bel canto repertoire, notably the works of Rossini, Bellini, and Donizetti.  She came to the attention of a much wider audience when she recorded at the request of the IOC in 1987 "Barcelona", a duet with Freddie Mercury, the lead singer of the British rock band Queen; the song was inspired by Caballé´s home city, later it was used as one of the two official theme songs for the 1992 Olympic Games. Takafumi Iwasaki (岩崎 貴文 , Iwasaki Takafumi ) is a Japanese guitarist, lyricist, music arranger, and musical artist from Kumamoto Prefecture.  He is signed to Columbia Music Entertainment, for which he is known for writing and performing various anime and tokusatsu theme songs.  He is known for his solo performance of the theme song of "Mahou Sentai Magiranger" and for performing guitar for the "Dragon Ball Kai" theme songs "Dragon Soul" and "Yeah!  Break!  Care!  Break! ", which he also composed.  He is part of Columbia's Project.R group for Super Sentai theme songs. "Legacy" is a song by American hip hop recording artist Eminem, taken from his eighth studio album "The Marshall Mathers LP 2" (2013).  The song discusses Eminem's dysfunctional childhood.  The song was produced by American record producer Emile Haynie and written by Eminem, Polina Goudieva, David Brook, and Emile Haynie.  The song features additional vocals from Russian singer-songwriter Polina.  "Legacy" was met with generally positive reviews from music critics upon the album's release.  The song has since peaked at number 44 on the US "Billboard" Hot R&B/Hip-Hop Songs.  "Legacy" became one of the official theme songs of WrestleMania XXX. "The Invisible Man" is a song by the British rock band Queen, written by drummer Roger Taylor but credited to Queen.  The song is sung mostly by Freddie Mercury, with vocal contributions from Taylor.  Originally released on the album "The Miracle", it was released as a single in 1989.  Taylor claims that he got the inspiration to create the song while reading a book (possibly the book of the same name), and the bassline instantly came to his imagination.  This song marks the only time in any of Queen's songs that all four band members names are mentioned in the lyrics.  The first being Freddie Mercury, followed by John Deacon.  Brian May's name is then said twice (just before his guitar solo starts), and while saying "Roger Taylor", the first "r" is rolled to emulate the drums at the end of the verse.  Freddie Mercury's name is said by drummer Roger Taylor, and the other ones by the lead singer Freddie Mercury. The Freddie Mercury Album is a posthumous solo project with material from Queen frontman and vocalist Freddie Mercury released in 1992, to observe the anniversary of his death.  The album is mainly made up of remixes from his past releases, as well as the original versions of "Barcelona", "Love Kills", "Exercises in Free Love", and "The Great Pretender".  A week later, The Great Pretender, its US counterpart, was released. Lover of Life, Singer of Songs (with the subtitle "The Very Best of Freddie Mercury Solo") is a compilation album of Freddie Mercury's solo songs.  It was released (except in the U.S.) on 4 September 2006, the day before Mercury's 60th Birthday.  It was released on 21 November 2006 in the U.S, three days before the 15th anniversary of Mercury's death. Natalia Troitskaya (1951 – 9 April 2006) was a Russian operatic soprano who had a major international career during the 1980s and early 1990s.  She particularly excelled in the operas of Giacomo Puccini and Giuseppe Verdi.  Among her signature roles were Tatyana in Pyotr Ilyich Tchaikovsky's "Eugene Onegin" and the title heroines in Verdi's "Aida", Puccini's "Manon Lescaut", and Puccini's "Tosca".  She was a frequent partner of Plácido Domingo during the 1980s and also sang opposite other great artists like Montserrat Caballé, Dmitri Hvorostovsky, and Luciano Pavarotti. "Too Much Love Will Kill You" is a song written by British guitarist Brian May of Queen, Frank Musker, and Elizabeth Lamers.  The song reflected the breakdown of May's first marriage and attraction to his future wife, Anita Dobson.  It was first recorded by Queen around 1988 or before, and was intended to be on the band's "The Miracle" album in 1989, but did not make the cut due to legal disputes following the band's decision that all songs on the album would be written by the group as opposed to individuals.  After Freddie Mercury's death in 1991, May arranged a solo version, which he performed at the Freddie Mercury Tribute Concert in 1992, and subsequently included on his solo album "Back to the Light" that same year.  Released as a single, it reached No. 5 on the UK Singles Chart.  Because it was first played publicly at The Freddie Mercury Tribute Concert, a common misconception is that it was written as a tribute to Freddie Mercury, although it had actually been written several years before he died.
Answer: Montserrat Caballé