Question: Which Icelandic TV cast performed on the album "Nick Holiday"?

Context paragraphs:
Réttur: Réttur (] , "Court") is an Icelandic TV series.  It was created and produced by Sigurjón Kjartansson of RVK Studios.  Retitled Case in English-language markets, Réttur was picked up by NBC and producer Howard Gordon for a US remake.  Season 1 and 2 feature a different case every episode, while season 3 is a single case that gets solved throughout the season.

Rokk í Reykjavík (soundtrack): Rokk í Reykjavík was the soundtrack to the Icelandic TV documentary directed by Friðrik Þór Friðriksson during 1981-82 winter and released in 1982. <br>

The Sound of Your Heart (TV series): The Sound Of Your Heart (Hangul: 마음의 소리 / RR: Maeumui Sori) is a South Korean sitcom starring Lee Kwang-soo and Jung So-min.  The sitcom is based on the Webtoon "The Sound of Heart."  The first 10 episodes were aired as a web series on November 7, 2016 through Naver TV Cast on Mondays at 6:00 (KST), and the remaining 10 episodes aired from December 2016.  The web series hit 100 million views on Sohu TV and ranked No. 1 among Korean dramas on the site.  On Naver TV Cast, the web series has more than 40 million views in South Korea as of February 2017.  It is also now airing on Netflix.

Nick Holiday: Nick Holiday is a Christmas Collection album released on November 1, 2005 by Nick Records.  It includes Christmas songs sung by the cast of the Nickelodeon TV series "SpongeBob SquarePants", "Dora the Explorer", "Jimmy Neutron", "Blue's Room", "The Fairly Odd Parents", "The Backyardigans", "LazyTown", "Wonderpets", "Rugrats" and "All Grown Up! ".

Barði Jóhannsson: Barði Jóhannsson (born 10 September 1975) is an Icelandic musician, composer, writer, TV show host (of the surrealist Icelandic TV show "Konfekt"), clothing designer and film director.  He is mostly known for his work with the groups Bang Gang, Lady & Bird (a side project with Keren Ann) and Starwalker, a collaboration with Jean-Benoît Dunckel.

Kristín Helga Gunnarsdóttir: Kristín Helga Gunnarsdóttir (born November 24, 1963) is an Icelandic children's writer, columnist and novelist.  Kristín is an awarded writer of books for children of all ages and is popular all over Iceland for the series of books on Fiasol.  Kristín Helga has also written for theater, radio and television.  Kristín is a journalist and a former reporter and a newscaster for an Icelandic TV channel Stöð 2 and on the radio.  She studied journalism and Spanish at the University of Utah, along with Spanish studies at the University of Iceland and at the University of Barcelona.

LazyTown: LazyTown is an Icelandic live action children's television program created by Magnús Scheving.  The series originally aired on Nickelodeon in the United States, CBeebies in the United Kingdom, RÚV in Iceland.

Baltasar Breki Samper: Baltasar Breki Samper (born 22 July 1989), sometimes referred to as Baltasar Breki Baltasarsson, is an Icelandic actor.  He is the son of Icelandic director Baltasar Kormákur.  Before graduating from the Icelandic Academy of the Arts in 2015 Samper helped his father on several films as second assistant director.  He is known for his role as Hjörtur in the Icelandic TV series "Trapped".

Ilmur Kristjánsdóttir: Ilmur Kristjánsdóttir (born 19 March 1978) is an Icelandic actress, screenwriter and politician.  She is known for her role as Hinrika in the Icelandic TV series "Trapped".

Sigurjón Kjartansson: Sigurjón Kjartansson (born 20 September 1968) is an Icelandic writer and producer.  Showrunner of "Trapped".  He is known for his role in the radio duo Tvíhöfði with Jón Gnarr and for his part in the popular Icelandic television sketch comedy "Fóstbræður".  He has since written many Icelandic TV series, including "Svínasúpan" (2004), "Stelpurnar" (2005-2008) and the drama series "Pressa" (2007-2012), "Réttur" (2009-2010) Réttur was later picked up by NBC for an US remake.  In the years 1988 to 1994, he was active in the Icelandic music scene as vocalist and lead guitarist in the metal band HAM.  In 1992 he wrote the score for the Icelandic cult film "Sódóma Reykjavík".

Supporting paragraphs: Nick Holiday LazyTown
Answer: LazyTown