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|Born||12 February 1976|
|Associated acts||Ina Wroldsen|
As young Arnþór attended Adolf Fredrik's Music School in Stockholm, Sweden. He began his professional songwriting and production career in 1996 working at Cosmos Studios together with Kent (Gillström) Isaacs and Bloodshy. In 1997, the founders of Murlyn Music, Anders Bagge and Christian Wåhlberg, saw the potential in Arnþór and Bloodshy, and handpicked them for the newly formed production company. Arnþór's breakthrough came a year later with the song "Because of You" written for 98 Degrees. Arnþór specifically desired to collaborate with Janet Jackson, saying "let's just say we will definitely be prepared if and when that happens." During his tenure at Murlyn Music (until 2003) a series of hits were created for artists such as Janet Jackson, Ronan Keating, Jennifer Lopez, Samantha Mumba and Celine Dion.
In 2008 Arnþór founded the Swedish-based record and production company, Aristotracks, together with businessman Linus Andreen and artist Emilia de Poret. Since then he has written and produced songs for artists such as Britney Spears, Leona Lewis and Shontelle.
Selected songs written / co-written and produced
- 1998 - 98 Degrees "Because of You" - producer/co-writer
- 2000 - Samantha Mumba "Gotta Tell You" - producer/co-writer
- 2001 - Jessica Simpson "Irresistible" - producer/co-writer
- 2002 - Carlos Santana "Let Me Love You Tonight" - producer/co-writer
- 2003 - Celine Dion "Sorry for Love" - co-writer
- 2004 - Janet Jackson "All Nite (Don't Stop)" - producer/co-writer
- 2006 - Danity Kane "Stay with Me" - producer/co-writer
- 2006 - Shane Filan / Westlife "Beautiful in White" - co-writer
- 2007 - Westlife "Us Against the World" - producer/co-writer
- 2007 - Westlife "Something Right" - producer/co-writer
- 2007 - Westlife "The Easy Way" - producer/co-writer
- 2007 - Westlife "Pictures in My Head" - producer/co-writer
- 2007 - Vanessa Hudgens "Say OK" - producer/co-writer
- 2007 - Enrique Iglesias "Wish I Was Your Lover" - producer/co-writer
- 2007 - Shayne Ward "No U Hang Up" - co-producer/co-writer
- 2008 - Emilia de Poret "Pick Me Up" - producer/co-writer
- 2009 - Natalie Bassingthwaite "Alive" - producer/co-writer
- 2009 - Leona Lewis "My Hands" - producer/co-writer
- 2010 - Shontelle "Impossible" - producer/co-writer
- 2012 - James Arthur "Impossible" - co-writer
- 2013 - Kim Cesarion "Undressed" - co-producer/co-writer
- 2015 - Tove Styrke "Ego" - co-writer
- Arnthor Birgisson. "Arnthor Birgisson". LinkedIn.
- "NORTHERN LIGHTS". Sound On Sound. October 2001. Archived from the original on 2014-09-15.
- "BMI Honors Top European Writers, Publishers at 2005 London Awards; Steve Winwood Named a BMI Icon - News - BMI.com". BMI. 28 November 2005.
- Popjustice. "Popjustice Blog".