Question: With which band was Guðmundur Gunnarsson's daughter initially the lead singer ?
Related documents: [0]  [DOC] 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). [END] 
[1]  [DOC] 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. [END] 
Answer: 
The Sugarcubes,
The Sugarcubes,