The band was formed in mid-2001 by 16 people, some from Orsa Spelmän, and Helen Sjöholm and since 2004 Tommy Körberg as singers.

BAO includes some of Sweden's most experienced contemporary and folk musicians: All members of the band are occupied in external capacities during the majority of the year, some in the theater orchestras in Stockholm.

The brothers Moraeus, Leif Göras and Nicke Göthe play together in Orsa Spelmän.

During the summers the members of BAO meet up and rehearse, and then go out on mini-tours, to which tickets are highly sought after.

Grammis is a national Swedish music prize governed by IFPI Sweden and awarded annually in numerous categories for best recordings released in the previous year.