Ingebrigt studied jazz at the Trondheim Conservatory, later he formed his style by playing with various Scandinavian and overseas bands.He calls Derek Bailey, George Russell, Chris McGregor, film director Ingmar Bergman teachers, and punk music and modern pop, everyday images and sounds as sources of inspiration. Critics compare the double bass player with such celebrities as Paul Chambers, Wilbur Ware, Charlie Haden, Malachi Favors.
Without this improviser, it would be difficult to imagine the projects of "The Thing", "Free Fall", "Atomic", "Scorch Trio". In 2004, he made his debut as a leader with the "Chicago Sextet" he formed, and since 2011, the group "The Young Mothers" founded in Austin (Texas, USA) has become the exponent of his aesthetics and philosophy.In 2006, the bass player went to the USA, first staying in Chicago, then in Austin. After arriving in Texas, he founded not only the group, but also the avant-garde festival "Sonic Transmissions", which united the punk, hip-hop, "free jazz" and "indie" scenes. Critics recognized that the Norwegian opened up new territories for local music and significantly raised the bar for alternative creativity in Austin. From 2015 to 2020, Sonic Transmissions presented over 100 musicians from the USA, Latin America, Norway and other European countries.
Since the 2020s, I.H. Flaten has been living in Norway again, where he continues to develop the ideas of this festival, having founded a kind of branch of it, Sonic Transmissions North, and the record company Sonic Transmissions Records.
In addition to the aforementioned groups, the bassist plays in the groups Icepick, I.P.A. and Dave Rempis' Percussion Quartet, in various duos and solos. His tour routes have stolen many countries around the world, and the instrument is featured on more than 200 albums.I. H. Flaten has performed and recorded music with Frode Gjerstad, Dave Rempis, Bobby Bradford, the AALY Trio, Ken Vandermark, Stephen Gauci, Tony Malaby, Daniel Levin, Dennis Gonzalez and many other jazz masters
In 2018, the bassist was awarded the most important Norwegian jazz award "Buddy Prize". With the band Atomic, he twice won the Spellemannprisen, known as the Norwegian Grammy.
