"Jonas Kullhammar (September 2, 1978 in Nacka, Sweden) is a Swedish jazz composer, saxophonist and is one of Sweden's most established jazz musicians.

Since 1998 his main group has been Jonas Kullhammar Quartet, and he has participated on over 150 records as a sideman. In year 2000 he released his debut recording, the self-produced "Salut". It won him Sweden Radio's Jazz Cat award as the newcomer of the year. He also received the Django D'or award and received the price Sweden Radio's Jazz Cat as Jazz Musician of The Year in Sweden two years in a row. The group also received the award for jazz group of the year. Since then the band has toured around the world and released more CDs. Jonas is also a founding member of the groups Kullrusk and Nacka Forum. Since 2000 he runs the record label Moserobie, that releases mainly Swedish and Norwegian jazz groups.

Kullhammar has worked with artists and bands The (International) Noise Conspiracy, Carlos Garnett, Nicolai Dunger, Fredrik NorŽn Band, The Torbjšrn Zetterberg Hot Five, Sonic Mechatronik Arkestra, Peanuts Hucko, The Plan, Nina Ramsby, Goran Kajfes, Marcus Strickland, Eldkvarn, Jupiter Trio, The Core, Mulatu Astatke, Salem Al Fakir, The Hives, Ted Curson, Chick Corea, Jason Moran, Dungen, Rickie Lee Jones and many more."

"Torbjörn Zetterberg (born 10 May 1976) is a Swedish jazz musician (double bass) and composer, known from collaborations with Jonas Kullhammar.

Zetterberg attended Södra Latin och Fridhems Folkhögskola in Svalöv but was first recognised as bassist when he studied at Kungliga Musikhögskolan in Stockholm still very young. Here he studied bass under guidance of Jan Adefelt. Soon he joined drummer Fredrik Norén's band together with the saxophonist Jonas Kullhammar. Already at this point one could sense that he would become a prominent figure in the Swedish jazz scene. Now his name is firmly rooted in the vibrant progressive selection as the new jazz generation.

He went through a personal crisis and did not record as a bandleader for more than seven years. Zetterberg was uncomfortable with his career and in 2010 he decided to leave the urban life including his bass, and moved to a Buddhist temple. There he resided for a year and still spends half of his time there in 2016. This existential crisis led to the production of the album Och Den Stora Frågan ("And the Big Question" in Swedish) in 2014. Here he collaborated with well known musicians from his earlier career, like the Portuguese trumpeter Susana Santos Silva and drummer Jon Fält, known from albums with pianist Bobo Stenson's trio. The album is "charged with joyful urgency, shiny optimism and confident flowing energy, despite the doubts and uncertainties that accompany any creative, artistic process", the reporter of All About Jazz stated in 2014."