Question: Who was the spouse of the composer of In the Hall of the Mountain King?

full_context: Document 1: Jan Garbarek: Garbarek was born in Mysen, Norway, the only child of a former Polish prisoner of war, Czesław Garbarek, and a Norwegian farmer's daughter. He grew up in Oslo, stateless until the age of seven, as there was no automatic grant of citizenship in Norway at the time. When he was 21, he married Vigdis. He is the father of musician and composer Anja Garbarek.
Document 2: Classical music: Numerous examples show influence in the opposite direction, including popular songs based on classical music, the use to which Pachelbel's Canon has been put since the 1970s, and the musical crossover phenomenon, where classical musicians have achieved success in the popular music arena. In heavy metal, a number of lead guitarists (playing electric guitar) modeled their playing styles on Baroque or Classical era instrumental music, including Ritchie Blackmore and Randy Rhoads.
Document 3: Classical music: Similarly, movies and television often revert to standard, clichéd snatches of classical music to convey refinement or opulence: some of the most-often heard pieces in this category include Bach´s Cello Suite No. 1, Mozart's Eine kleine Nachtmusik, Vivaldi's Four Seasons, Mussorgsky's Night on Bald Mountain (as orchestrated by Rimsky-Korsakov), and Rossini's William Tell Overture.
Document 4: Classical music: The dates are generalizations, since the periods and eras overlap and the categories are somewhat arbitrary, to the point that some authorities reverse terminologies and refer to a common practice "era" comprising baroque, classical, and romantic "periods". For example, the use of counterpoint and fugue, which is considered characteristic of the Baroque era (or period), was continued by Haydn, who is classified as typical of the Classical era. Beethoven, who is often described as a founder of the Romantic era, and Brahms, who is classified as Romantic, also used counterpoint and fugue, but other characteristics of their music define their era.
Document 5: Borghild Holmsen: Borghild Holmsen was born in Kråkstad (now Ski), Akershus, Norway. When she was 7 years old, her family settled in Christiania (now Oslo). She studied piano with Agathe Backer-Grøndahl and Otto Winter-Hjelm, and continued her studies with Carl Reinecke and Salomon Jadassohn in Leipzig and Albert Becker in Berlin.
Document 6: Norway Lutheran Church and Cemetery: The Norway Lutheran Church and Cemetery are located 10 miles south of Denbigh, North Dakota and were listed on the National Register of Historic Places (NRHP) in 1994. The NRHP listing includes the main church structure, a cemetery, and two contributing privies to the west and rear of the church, all situated on a site. A pyramid-shaped monument topped with an iron cross is located at the northeast corner of the cemetery and marks site of an older log church. Norwegian skier Sondre Norheim was buried in the cemetery in 1897.
Document 7: Classical music: Several works from the Golden Age of Animation matched the action to classical music. Notable examples are Walt Disney's Fantasia, Tom and Jerry's Johann Mouse, and Warner Bros.' Rabbit of Seville and What's Opera, Doc?.
Document 8: Classical music: Certain staples of classical music are often used commercially (either in advertising or in movie soundtracks). In television commercials, several passages have become clichéd, particularly the opening of Richard Strauss' Also sprach Zarathustra (made famous in the film 2001: A Space Odyssey) and the opening section "O Fortuna" of Carl Orff's Carmina Burana, often used in the horror genre; other examples include the Dies Irae from the Verdi Requiem, Edvard Grieg's In the Hall of the Mountain King from Peer Gynt, the opening bars of Beethoven's Symphony No. 5, Wagner's Ride of the Valkyries from Die Walküre, Rimsky-Korsakov's Flight of the Bumblebee, and excerpts of Aaron Copland's Rodeo.
Document 9: Classical music: Saxophones appear in some scores from the late 19th century onwards. While appearing only as featured solo instruments in some works, for example Maurice Ravel's orchestration of Modest Mussorgsky's Pictures at an Exhibition and Sergei Rachmaninoff's Symphonic Dances, the saxophone is included in other works, such as Ravel's Boléro, Sergei Prokofiev's Romeo and Juliet Suites 1 and 2 and many other works as a member of the orchestral ensemble. The euphonium is featured in a few late Romantic and 20th-century works, usually playing parts marked "tenor tuba", including Gustav Holst's The Planets, and Richard Strauss's Ein Heldenleben.
Document 10: Griegprisen: Griegprisen (established 1972 in Bergen, Norway) is awarded by the «Edvard Grieg Museum Troldhaugen» to a Norwegian musician, conductor or musicologist who in a special way have communicated the music of Edvard Grieg. It has also been awarded an extraordinary five times to people who have made a special effort to Edvard Grieg and Troldhaugen. The prize is awarded every year on the birthday of Edvard Grieg, 15 June.
Document 11: Einar Sverdrup: Einar Sverdrup studied to be a mining engineer in the United States and at the Norwegian Institute of Technology in Trondhjem. In 1923 in Trondhjem he married Dagny Lorck. The couple had three children, and settled in Bærum. Sverdrup eventually became the CEO of the Store Norske Spitsbergen Kulkompani, a Norwegian coal mining company based in Svalbard.
Document 12: Symphony: At the beginning of the 19th century, Beethoven elevated the symphony from an everyday genre produced in large quantities to a supreme form in which composers strove to reach the highest potential of music in just a few works. Beethoven began with two works directly emulating his models Mozart and Haydn, then seven more symphonies, starting with the Third Symphony (``Eroica '') that expanded the scope and ambition of the genre. His Symphony No. 5 is perhaps the most famous symphony ever written; its transition from the emotionally stormy C minor opening movement to a triumphant major - key finale provided a model adopted by later symphonists such as Brahms and Mahler. His Symphony No. 6 is a programmatic work, featuring instrumental imitations of bird calls and a storm; and, unconventionally, a fifth movement (symphonies usually had at most four movements). His Symphony No. 9 includes parts for vocal soloists and choir in the last movement, making it a choral symphony.
Document 13: Nygård, Norway: Nygård is a neighbourhood in the city centre of Bergen in Hordaland county, Norway. It is located south of the Lille Lungegårdsvannet lake in the city centre and north of the Møhlenpris neighborhood. Grieghallen, St. Jacob's Church, and parts of the University of Bergen are located in Nygård.
Document 14: Troldhaugen: Troldhaugen is the former home of Norwegian composer Edvard Grieg and his wife Nina Grieg. Troldhaugen is located in Bergen, Norway and consists of the Edvard Grieg Museum, Grieg’s villa, the hut where he composed music, and his and his wife's gravesite.
Document 15: Carl Nielsen Museum: The Carl Nielsen Museum is a museum dedicated to the life of Danish composer Carl Nielsen and his wife, the sculptor Anne Marie Carl-Nielsen. It documents his life from his childhood in the town of Nr. Lyndelse, to his career and success on the European music scene, with his violins, his bugle and his grand piano on display, as well as a number of his musical scores, including six symphonies, three concertos, two operas, and chamber music and a great number of songs.
ground_truth: Nina Grieg
sub_queries: Who wrote in the Hall of the Mountain King? Answer: Edvard Grieg
Edvard Grieg >> spouse Answer: Nina Grieg