Question: In 2015 Ramon Tebar was named  Principal Guest Conductor of an opera house located in what city?

Context paragraphs:
Silvio Varviso: Silvio Varviso (26 February 19241 November 2006) was a Swiss conductor who spent most of his career devoted to conducting opera.  He began his conducting career working in minor opera houses in Switzerland in the mid-1940s.  He became the principal conductor of the opera house in Basel in 1956 where he served for six years.  In the late 1950s he began appearing with major opera houses on the international stage as a guest conductor.  During the 1960s, he became a fixture at the Metropolitan Opera in New York City and at the Royal Opera House in London.  In 1965 he became the music director of the Royal Swedish Opera, and later in his career served as the music director of the Staatsoper Stuttgart and the Paris Opera.  During the early 1990s he became a permanent guest conductor at the Vlaamse Opera where he remained active up until his death.

Cynthia Johnston Turner: Cynthia Johnston Turner is a conductor and clinician in the United States, Latin America, Europe and Canada.  She is currently on the faculty of the Hugh Hodgson School of Music at the University of Georgia, having formerly served on the faculty of Cornell University, where she directed the Wind Ensemble, Wind Symphony and chamber winds.  Johnston Turner is guest conductor with the Syracuse Society for New Music and principal guest conductor with the Austrian Festival Orchestra and Paris Lodron Ensemble in Salzburg.

Gianfranco Masini: Gianfranco Masini (26 November 1937 – 18 June 1993) was an Italian orchestra conductor, primarily known for conducting opera.  During the course of his career he was a principal conductor at the Teatro Lirico Giuseppe Verdi in Trieste and at the Arena di Verona Festival.  He appeared in numerous opera houses in Europe and North America as a guest conductor and was the principal guest conductor of the Stadttheater Bonn in 1990.  At the time of his death, he was the principal conductor and artistic director of Montpellier Opera.

Ramón Tebar: José Ramón Tebar Sáiz (November 6, 1978, Valencia, Spain) is a conductor and pianist, currently Principal Conductor at Florida Grand Opera.  He is Artistic and Music Director of Palm Beach Symphony and Opera Naples.  He was Music Director of the Festival of Santo Domingo, Dominican Republic (2009-2015).  In March 2015, he was named Principal Guest Conductor of Spain's Palau de les Arts Reina Sofia.

Kazuhiro Koizumi: Kazuhiro Koizumi (小泉 和裕 , Koizumi Kazuhiro , born 1949) is a Japanese conductor who has had an active international career since the 1970s.  He has appeared as a guest conductor throughout Europe and the United States, appearing with such ensembles as the Berlin Philharmonic and the Chicago Symphony Orchestra.  He is the current principal conductor of both the Tokyo Metropolitan Symphony Orchestra, a post he has held since 2008, and the Century Orchestra Osaka (2003).  Since 2006 he has been a current principal guest conductor with the Sendai Philharmonic Orchestra.

Palau de les Arts Reina Sofia: Palau de les Arts Reina Sofia (] ; Spanish: "Palacio de las Artes Reina Sofía" ; anglicised as "Reina (Queen) Sofía Palace of the Arts") is an opera house and cultural centre in Valencia, Spain.  It opened on 8 October 2005; its first opera staging was of Beethoven's "Fidelio" on 25 October 2006.  Tenor and conductor Plácido Domingo has maintained a special relationship with the Palau since its founding and has established a young singers training program there.

Claudio Abbado: Claudio Abbado, (] ; 26 June 1933 – 20 January 2014) was an Italian conductor.  One of the most celebrated and respected conductors of the 20th century, particularly in the music of Gustav Mahler, he served as music director of the La Scala opera house in Milan, principal conductor of the London Symphony Orchestra, principal guest conductor of the Chicago Symphony Orchestra, music director of the Vienna State Opera, founder and director of Lucerne Festival Orchestra, music director of European Union Youth Orchestra and principal conductor of the Berlin Philharmonic orchestra.

Christopher Seaman: Christopher Seaman (born 7 March 1942, Faversham) is a British conductor, the son of Albert Edward Seaman and Ethel Margery Seaman.  He was educated at Canterbury Cathedral Choir School and The King's School, Canterbury, and later studied at King's College, Cambridge.  From 1964 to 1968, he was principal timpanist with the London Philharmonic Orchestra, before his appointment from 1968 to 1970 as assistant conductor with the BBC Scottish Symphony Orchestra (BBC SSO).  He later served as the BBC SSO's principal conductor, from 1971 to 1977.  Seaman has also held the post of Principal Guest Conductor and Artistic Advisor to the conducting course at the Guildhall School of Music.  He also had a long association with the National Youth Orchestra of Great Britain.

Keitaro Harada: Keitaro Harada (, born February 26, 1985) is a Japanese conductor and is Associate Conductor of Cincinnati Symphony Orchestra Arizona Opera, Richmond Symphony Orchestra and Principal Guest Conductor of Sierra Vista Symphony Orchestra.  He has been Music Director & Conductor of the Phoenix Youth Symphony, Assistant Conductor of Macon Symphony Orchestra.  In 2013, he was featured in the Bruno Walter National Conductor Preview by the League of American Orchestras.  In 2014 and 2015, he received The Solti Foundation U.S. Career Assistance Award.

James Lowe (conductor): James Lowe is an orchestra conductor.  He will assume his role of Chief Conductor of the Prussian Chamber Orchestra from the 2015/16 season.  His work as Artistic Director of the Hallé Harmony Youth Orchestra was featured in a four-part documentary shown in the UK on Channel 4 in 2010.  A recipient of the Bernard Haitink Fund for Young Talent, Lowe is Principal Conductor of the Edinburgh Contemporary Music Ensemble, Principal Guest Conductor of Music for Everyone, Orchestras Advisor and conductor of the Senior Orchestra of the National Youth Orchestra of Scotland and held the position of Associate Conductor of the Royal Scottish National Orchestra.  James is also Artistic Advisor of the Nottingham Youth Orchestra, with whom he began his orchestral career.

Supporting paragraphs: Ramón Tebar Palau de les Arts Reina Sofia
Answer: Valencia