Gustav Lorentzen also known by his stage name

Stage name

A stage name, also called a showbiz name or screen name, is a pseudonym used by performers and entertainers such as actors, wrestlers, comedians, and musicians.-Motivation to use a stage name:...

 Ludvigsen, was a Norwegian singer-songwriter

Singer-songwriter

Singer-songwriters are musicians who write, compose and sing their own musical material including lyrics and melodies. As opposed to contemporary popular music singers who write their own songs, the term singer-songwriter describes a distinct form of artistry, closely associated with the...

, best known from being half of the successful duo Knutsen & Ludvigsen

Knutsen & Ludvigsen

Knutsen & Ludvigsen was a Norwegian singing duo consisting of Øystein Dolmen and Gustav Lorentzen .Writing and performing various songs mostly aimed at children, they released seven albums, two of which received Spellemannprisen - the Norwegian Grammy. They had several #1 hits, including "Grevling...

, alongside Øystein "Knutsen" Dolmen

Øystein Dolmen

Øystein Dolmen , also known as Knutsen, is a Norwegian singer-songwriter best known for being one half of the duo Knutsen & Ludvigsen, alongside Gustav Lorentzen...

. He went solo in 1986, winning four Spellemann awards

Spellemannprisen

Spellemannprisen is an award presented to Norwegian musicians for their contributions.-Operation:The award was established on the initiative of International Federation of the Phonographic Industry , an organization that represents the interests of the recording industry worldwide...

 and one nomination for his 5 albums.

In addition to music, Lorentzen made several TV series and books, mostly intended for children. He also had a degree in acoustics

Acoustics

Acoustics is the interdisciplinary science that deals with the study of all mechanical waves in gases, liquids, and solids including vibration, sound, ultrasound and infrasound. A scientist who works in the field of acoustics is an acoustician while someone working in the field of acoustics...

 from the Norwegian Institute of Technology

Norwegian Institute of Technology

The Norwegian Institute of Technology, known by its Norwegian abbrevation NTH was a science institute in Trondheim, Norway. It was established in 1910, and existed as an independent technical university for 85 years, after which it was merged into the University of Trondheim as an independent...

.

From 1997 until his death, Lorentzen collaborated with the psychologist Magne Raundalen, creating a therapeutic program for traumatized children, mainly victims of wars. He was also a UNICEF Ambassador since 1993.

On 21 April 2010, Lorentzen collapsed during an orienteering

Orienteering

Orienteering is a family of sports that requires navigational skills using a map and compass to navigate from point to point in diverse and usually unfamiliar terrain, and normally moving at speed. Participants are given a topographical map, usually a specially prepared orienteering map, which they...

 competition outside of Bergen

Bergen

Bergen is the second largest city in Norway with a population of as of , . Bergen is the administrative centre of Hordaland county. Greater Bergen or Bergen Metropolitan Area as defined by Statistics Norway, has a population of as of , ....

 and went into cardiac arrest

Cardiac arrest

Cardiac arrest, is the cessation of normal circulation of the blood due to failure of the heart to contract effectively...

. He was pronounced dead a few minutes later.