Mattson was a founding member in 1980 of the seminal Swedish folk ensemble Groupa along with Mats Edén.
The group wrote and played a major part of the music to theatre project Den stora vreden (rough translation: The Great Wrath) at Gävleborgs folkteater (the county theatre of Gävleborg), first time performed in 1988, that attracted much attention.
Mattson has also participated in the Swedish musical and dance ensemble Boot with Ola Bäckström (viola d'amore, bouzouki) and Björn Tollin (percussion).
The album consists of twelve traditional and original songs, played entirely on two Swedish hurdy-gurdies by Brisland-Ferner and Mattson.
Specialized recording and computer editing techniques were used to produce a number of unique musical effects.