Question: With which band was Guðmundur Gunnarsson's daughter initially the lead singer ?

full_context: Document 1: Albert Guðmundsson: Albert Sigurður Guðmundsson (5 October 1923 – 7 April 1994) was the first Icelandic professional football player and played for, amongst others, Rangers, Arsenal, FC Nancy and AC Milan. After retiring from his sporting career he became a politician and was a member of Alþingi for 15 years, serving as Minister of Finance and Minister of Industry. He ran for president in 1980 but lost to Vigdís Finnbogadóttir.
Document 2: Brian Eno: Brian Peter George St John le Baptiste de la Salle Eno, RDI ( ; born 15 May 1948 and originally christened Brian Peter George Eno) is an English musician, composer, record producer, singer, writer, and visual artist. He is best known for his pioneering work in rock, ambient, pop, and electronic music. A self-described "non-musician", Eno has helped to introduce a variety of unique conceptual approaches and recording techniques into contemporary music, advocating a methodology of "theory over practice" throughout his career. He has been described as one of popular music's most influential and innovative figures.
Document 3: Homogenic: Homogenic is the third international solo album by Icelandic musician Björk, released in September 1997. Produced by Björk, Mark Bell, Guy Sigsworth, Howie B and Markus Dravs, it was released on One Little Indian Records. The music of "Homogenic" was a new style for Björk, focusing on similar-sounding music combining electronic beats and string instruments with songs in tribute to her native country Iceland. "Homogenic" was originally to be produced in her home in London, but was later recorded in Spain. "Homogenic" marked the first of several production collaborations between Björk and Mark Bell, whom Björk would cite as a major influence on her musical career. The album peaked at number twenty-eight on the "Billboard" 200, and at number four on the UK Albums Chart.
Document 4: Björk: Björk Guðmundsdóttir (] , born 21 November 1965), known as Björk ( ), is an Icelandic singer, songwriter, actress, record producer, and DJ. Over her four-decade career, she has developed an eclectic musical style that draws on a wide range of influences and genres spanning electronic, pop, experimental, classical, trip hop, IDM, and avant-garde styles. She initially became known as the lead singer of the alternative rock band The Sugarcubes, whose 1987 single "Birthday" was a hit on US and UK indie stations and a favorite among music critics. Björk embarked on a solo career in 1993, coming to prominence as a solo artist with albums such as "Debut" (1993), "Post" (1995), and "Homogenic" (1997), while collaborating with a range of artists and exploring a variety of multimedia projects.
Document 5: Vigdís Finnbogadóttir: Vigdís Finnbogadóttir was born in Reykjavík on 15 April 1930. Her father, Finnbogi Rútur Þorvaldsson, was a civil engineer, as well as a professor at the University of Iceland. Her mother, Sigríður Eiríksdóttir, was a nurse and the chairperson of the Icelandic Nurses Association. They had two children: Vigdís and then a son a year later. After passing her matriculation exam in 1949, Vigdís studied French and French literature at the University of Grenoble and the Sorbonne in Paris from 1949 to 1953, then studied the history of theater at the University of Copenhagen. She then acquired a BA in French and English, as well as a Professional Graduate Certificate in Education, at the University of Iceland. She married a physician in 1954, but divorced in 1963, and at the age of 41 she adopted a daughter, being the first single woman who was allowed to adopt a child.
Document 6: Homogenic Live: Homogenic Live is a live album by Icelandic singer Björk, collecting her favorite performances from her 1997-99 Homogenic Tour. It was Björk’s first tour to have soundboard recordings and thus the first of her live CDs to feature a wide variety of performances taken from different dates and venues throughout a single tour. Originally released in the 5 disc "Live Box" set in 2003, "Homogenic Live" was later released separately on 1 June 2004 by One Little Indian records.
Document 7: List of songs recorded by Björk: Icelandic singer and songwriter Björk has recorded more than one hundred songs for eight studio albums, two soundtrack albums, a compilation album, five remix albums and two collaboration albums. She is the sole writer and producer of most of the songs included in her albums. She also sometimes plays instruments during her recording sessions. Moreover, she has provided credited and uncredited contributions on songs recorded by other artists, including background vocals, songwriting, remixing and production.
Document 8: Homogenic Tour: The Homogenic tour was undertaken in 1997–99 by Icelandic singer/songwriter Björk. This tour focused on her album "Homogenic". She also added songs from her previous albums. 23 different songs were performed. The tour band consisted of an Icelandic string octet and musician Mark Bell on beats, who had co-produced the album with Björk. The tour was released on DVD as "Live in Cambridge". A separate release, "Homogenic Live", contains a selection of Björk's favourite performances from throughout the Homogenic tour.
Document 9: Björn Hjörtur Guðmundsson: Björn Hjörtur Guðmundsson (14 January 1911 – 14 July 1998), also known as Bjössi, was an Icelandic craftsman, master carpenter, idealist and environmental pioneer. He lived and worked in Borgarnes, Iceland, where he designed and constructed a small theme park for children called Bjössaróló, with play equipment which he built entirely from salvaged materials, and maintained it for many years. The President of Iceland, Vigdís Finnbogadóttir, visited Bjössaróló in 1993.
Document 10: Tappi Tíkarrass: Tappi Tíkarrass was an Icelandic punk band which added elements of funk, rock and jazz to their music, marking a difference from other traditional bands at that time. The band is also considered the first serious music project of now renowned singer Björk Guðmundsdóttir.
Document 11: Debut (Björk album): Debut is the first international solo studio album by Icelandic recording artist Björk. The album was released in July 1993 on One Little Indian and Elektra Records, and was produced by Björk in collaboration with artist Nellee Hooper. Her first recording following the dissolution of her previous band the Sugarcubes, the album departed from the rock-oriented style of her previous work and instead drew on an eclectic variety of styles across electronic pop, house music, jazz and trip hop.
Document 12: Björgólfur Guðmundsson: Björgólfur Guðmundsson (born 2 January 1941 in Reykjavík, Iceland) was the chairman and former owner of West Ham United FC. Björgólfur was Iceland's second businessman worth more than a billion dollars — his son, Björgólfur Thor Björgólfsson being the first. He was at one time the majority owner and chairman of the now nationalised Icelandic bank Landsbanki, the second largest company in Iceland. He was ranked by "Forbes" magazine in March 2008 as the 1014th-richest person in the world, with a net worth of $1.1 billion. In December of the same year Forbes revalued his net worth to $0 and on 31 July 2009 he was declared bankrupt by the Icelandic courts with debts of almost £500 million (96 billion ISK).
Document 13: Guðmundur Gunnarsson: Guðmundur Gunnarsson (born 29 October 1945) is an Icelandic electrician and union leader. The father of the singer Björk (Björk Guðmundsdóttir), he is a nationally known figure in his own right as the leader of the Icelandic Electricians' Union, Rafiðnaðarsamband Íslands (RSÍ).
Document 14: List of awards and nominations received by Björk: Björk is a singer-songwriter from Reykjavík, Iceland. Her debut album, "Björk", considered juvenilia, was released in 1977 by the Fálkinn record label. Her subsequent eight studio albums were released by One Little Indian Records: "Debut" (1993), "Post" (1995), "Homogenic" (1997), "Vespertine" (2001), "Medúlla" (2004), "Volta" (2007), "Biophilia" (2011) and "Vulnicura" (2015). Six of her albums have entered the top 10 in the UK Albums Chart, while "Volta", is her only album to reach the top 10 in the "Billboard" 200. Björk's record label, One Little Indian Records, reported that she has sold more than 20 million albums worldwide.
Document 15: Post (Björk album): Post is the second solo studio album by Icelandic musician Björk. The album was released in June 1995 through One Little Indian in the United Kingdom and Elektra Records in the United States. Unlike her previous release "Debut"—which was almost entirely produced by Nellee Hooper—"Post" is characterised by more collaborative efforts, including production by Hooper, 808 State's Graham Massey, and former Massive Attack member Tricky. Moreover, Björk co-produced every song on the album. "Post" received widespread critical acclaim from reviewers and was a commercial success, charting at number 2 in the United Kingdom and 32 in the United States. It was certified gold in New Zealand and Sweden, and platinum in Australia, Canada, the United States, and the United Kingdom. "Telegram", a remix album of songs from "Post", was released in 1996.
ground_truth: The Sugarcubes,