The Volta Tour was a tour by the singer Björk that focused on her album, "Volta".
 Overall, 48 songs were done on the tour focusing on many tracks from "Debut" through to "Vespertine", though mostly from "Medúlla" and "Volta", the former of which did not receive its own tour.
 The tour band consisted of drummer Chris Corsano, musician Mark Bell (who also accompanied Björk on the Homogenic tour), pianist Jónas Sen (who played celeste on the tracks Gratitude and Cetacea on the "Drawing Restraint 9" soundtrack), musician Damian Taylor and a 10 piece female Icelandic brass section.
 Many of the songs evolved considerably during the tour, including "Innocence" which was re-done so as to incorporate brass elements.
 Live performances of the track "Declare Independence" made heavy use of the ReacTable, an electro-acoustic music instrument with a tabletop Tangible User Interface, which is played by Damian Taylor.
 The Tenori-on was used heavily in performances of "Who Is It".
 A live DVD and CD of the Volta tour was released as part of "Voltaïc".
 The tour was Björk's first in four years and saw her play countries that she had not played in over ten years.
The Importance of Being Icelandic is a 1998 documentary film by the filmmaker Jon Gustafsson (born in Iceland and living in Canada) that traces the steps of three Icelandic Canadians on a different quest of discovering their Icelandic heritage by going to Iceland.
 In addition to their time in Iceland, he returns with them to Canada and captures their reactions of the Islendingadagurinn celebrated each year at Gimli.
 The contrasts in perspective between his viewpoint on Canadian culture and that of three Icelandic-Canadians on a quest for their ancestral heritage is at the centre of the documentary.
"Innocence" is a song written and recorded by Icelandic singer Björk.
 The song was released as the second single from her seventh full-length studio album, "Volta".
 It is co-produced by record producer Timbaland and his protégé Danja.
 The song was premiered on Björk's MySpace profile on March 19, 2007 as part of the fan contest to submit ideas for the music video.
 The single was released exclusively as a digital download on July 23, 2007.
Innocence (Thai: เด็กโต๋ , or "Dek To"), is a 2005 Thai independent documentary film directed by Areeya Chumsai and Nisa Kongsri about a boarding school for hill tribe children in Chiang Mai Province, Thailand.
Jon Gustafsson is an Iceland born film director.
 The Icelandic spelling of his name is Jón Gústafsson.
 Best known for directing the Canadian documentary film Wrath of Gods, starring Gerard Butler, Wendy Ord, Sarah Polley, Paul Stephens and Sturla Gunnarsson.
 He grew up in Iceland where he started his career as a television performer before studying filmmaking at Manchester Polytechnic and directing for film and theatre at CalArts where he was mentored by the legendary Ealing Studios director Alexander Mackendrick.
 Wrath of Gods was his second documentary for CBC Newsworld, the first one was The Importance of Being Icelandic.
 He immigrated to Canada where he directed the low-budget feature film Kanadiana and the music video Brighter Hell for the Canadian rock band The Watchmen.
 In 2011 Jon Gustafsson produced the award winning short film In A Heartbeat, directed by Karolina Lewicka, through his production company Artio Films.
The invasion of Iceland, codenamed Operation Fork, was a British military operation conducted by the Royal Navy and Royal Marines during World War II to occupy and deny Iceland to Germany.
 At the start of the war, Britain imposed strict export controls on Icelandic goods, preventing profitable shipments to Germany, as part of its naval blockade.
 Britain offered assistance to Iceland, seeking cooperation "as a belligerent and an ally", but Reykjavik declined and reaffirmed its neutrality.
 The German diplomatic presence in Iceland, along with the island's strategic importance, alarmed the British.
 After failing to persuade the Icelandic government to join the Allies, the British invaded on the morning of 10 May 1940.
 The initial force of 746 British Royal Marines commanded by Colonel Robert Sturges disembarked at the capital Reykjavík.
 Meeting no resistance, the troops moved quickly to disable communication networks, secure strategic locations, and arrest German citizens.
 Requisitioning local transport, the troops moved to Hvalfjörður, Kaldaðarnes, Sandskeið, and Akranes to secure landing areas against the possibility of a German counterattack.
Oddur Gottskálksson (1514/1515 – 1556) was the translator of the first book printed in Icelandic, the New Testament.
 His translation was based in part on an older translation by Jón Arason, and printed in Roskilde, Denmark.
 With this publication the status of Icelandic as a language separate from Danish within the Danish Church was recognized, and this was of great importance for the subsequent history of the Icelandic language.
The Icelandic sheep (Icelandic: "íslenska sauðkindin" ) is a breed of domestic sheep.
 The Icelandic breed is one of the Northern European short-tailed sheep, which exhibit a fluke-shaped, naturally short tail.
 The Icelandic is a mid-sized breed, generally short-legged and stocky, with face and legs free of wool.
 The fleece of the Icelandic sheep is dual-coated and occurs in white and a variety of other colors, including a range of browns, grays, and blacks.
 They exist in both horned and polled strains.
 Generally left unshorn for the winter, the breed is very cold-hardy.
 Multiple births are very common in Icelandic ewes, with a lambing percentage of 175% - 220%.
 A gene also exists in the breed called the Þoka gene, and ewes carrying it have been known to give birth to triplets, quadruplets, quintuplets, and even sextuplets on occasion.
Icelandic names differ from most current Western family name systems by being patronymic or occasionally matronymic: they indicate the father (or mother) of the child and not the historic family lineage.
 Iceland shares a common cultural heritage with the Scandinavian countries of Norway, Sweden and Denmark with the Faroe Islands.
 Icelanders, however, unlike other Scandinavians, have continued to use their traditional name system, which was formerly used by all Fennoscandian nations except partly Finland.
 The Icelandic system is thus not based on family names (although some people do have family names and might use both systems).
 Generally, a person's last name indicates the first name of their father (patronymic) or in some cases mother (matronymic).
 According to Icelandic name tradition, Icelandic surnames end in "-son" or "-dóttir" with few exceptions.
The Old Norwegian Homily Book (AM 619 4to) is one of two main collections of Old West Norse sermons.
 The manuscript was written around 1200, contemporary with the other principal collection of sermons, the Old Icelandic Homily Book; together they represent some of the earliest Old West Norse prose.
 The two homily books have 11 texts in common, all of which are based on earlier exemplars.
 Two of these texts, the 'Stave-church Homily' and a St. Michael’s Day sermon, are also found in one of the oldest Icelandic manuscript fragments, AM 237a fol., which was written around 1150.

Question: What do Innocence and The Importance of Being Icelandic have in common?
Answer: documentary