Björn Rosenström, born August 8, 1970, in the boroughs Tynnered in Gothenburg who resides in Bollebygd, is a Swedish songwriter who has performed as troubadour.

Nowadays, he is a part of Det jävla bandet during concerts and on the latest records.

In addition to being a songwriter and performer, he is also a lawyer; he has a Candidate of Law-degree from the University of Gothenburg.

Rosenström studied law 1991-1996, while he was actively involved in the university's pub business, where he quickly became known for his ironic and humorous songs that he performed on guitar in various celebrations.

Rosenström published 1,000 copies of the discs that he sold at his old university's pub and bookstore.