Question: When was the four-piece indie rock band, that joined The Killers on the Christmas song ¡Happy Birthday Guadalupe! formed?

Context paragraphs:
Tellison: Tellison is a four-piece indie rock band from London, England, formed in 2000.  The band consists of lead vocalist and guitarist Stephen Davidson, guitarist and vocalist Peter Phillips, bass guitarist and vocalist Andrew Tickell and drummer Henry Danowski.

¡Happy Birthday Guadalupe!: "¡Happy Birthday Guadalupe!"  is a Christmas song by Las Vegas rock band The Killers featuring Wild Light and Mariachi El Bronx, released as a digital download on December 1, 2009.

Ikara Colt: Ikara Colt were an English four-piece indie rock band, formed by art students at London Guildhall University.  They had a five-year career, beginning in 1999 and ending on 17 January 2005.  The band had stated in interviews their intention to disband before they "turn into some old, tired and jaded outfit"; this was the reasoning behind the decision to break up after just two albums and one EP.  In the UK, the band were signed to the London-based independent record label, Fantastic Plastic Records, while Epitaph distributed their records in the US.

Masters of the Hemisphere: Masters of the Hemisphere are an American indie pop group, founded by Bren Mead and Sean Rawls.  The two moved to Athens, Georgia, to attend college in 1996.  There they met Ryan Lewis, co-founder of Kindercore Records, who played drums at the first Masters of the Hemisphere show.  Jeff Griggs (also of The Mendoza Line) soon replaced Lewis.  In 1997 Kindercore released their debut seven-inch ep, "Going on a Trek to Iceland".  The group then recorded their first full length album, the eponymous "Masters of the Hemisphere", which was released on Kindercore Records in 1998.  The band soon expanded to a four-piece, adding multi-instrumentalist Adrian Finch.  Several singles and compilation appearances followed, including a release on the Happy Happy Birthday To Me Records singles club, before the band released their second full length, the concept album "I Am Not a Freemdoom", also on Kindercore.  The record garnered mixed reviews, which in part was likely due to the album's rather complicated concept, regarding an island of reservoir-dwelling creatures being enslaved by an evil dog.  The "Permanent Stranger" EP followed in 2002, on the dcBaltimore2012 label.  The band split up after their next album, 2002's well received "Protest a Dark Anniversary".  A recording of their then-final show at Athens, Georgia's 40 Watt Club was later released as "The Last Show Ever".

The Badgeman: The Badgeman were a four-piece indie rock band from Salisbury, Wiltshire formed in 1988, although music journalist Pete Frame claims in his book "Rockin Around Britain" that the band hailed from Melksham.  The band has been variously categorised as Alternative rock, shoegazing, indie rock, psychedelic rock, and post punk.  The band released two albums on Paperhouse Records, and appeared on two compilation releases, along with artists such as Nirvana, Lee Ranaldo of Sonic Youth, Echo and The Bunnymen, and The Wedding Present.

Fishboy (band): Fishboy is an American four-piece indie pop band from Denton, Texas, United States, that began as the solo project of Eric Michener.  He was given the nickname on a middle-school field trip after a dare to pluck and swallow a fish at the Dallas World Aquarium.  The band is signed to Happy Happy Birthday To Me Records in Athens, Georgia and associated with the Austin, Texas music collective Business Deal Records.

Little Man Tate (band): Little Man Tate were a four-piece indie rock band from Sheffield, England who formed in 2005.  They broke up in 2009.  The band quickly began attracting interest from several record labels and in March 2006 signed to V2 Records, later parting ways in November 2007.  Their fifth single, "Sexy in Latin" was released on 22 January and became their highest charting single.

The Mondrians: The Mondrians are a four-piece indie rock band from Switzerland.  The band formed in the summer of 2005 after recording their first four-track home-made demo, including the songs "Pearl Of The Lake" and "The Shout."

The Holloways: The Holloways were an English four-piece indie rock band from North London.  Their single "Generator" reached number 14 in the UK Singles Chart on 11 June 2007.  They had five No.1 singles on the UK Indie Chart and several Top 40 singles.  Their debut album, "So This Is Great Britain?" , was awarded 8 out of 10 by "NME".

Wild Light: Wild Light was an American four-piece indie rock band from New Hampshire, United States, composed of multi-instrumentalists/vocalists Tim Kyle and Seth Pitman, guitarist/vocalist Jordan Alexander, and drummer Seth Kasper.  The band formed in 2005 and released its first full-length album, "Adult Nights", in March 2009.  Kyle is a former member of the Canadian band, Arcade Fire.

Supporting paragraphs: ¡Happy Birthday Guadalupe! Wild Light
Answer: 2005