Theresa Emilia Amper, born June 5, 1981 [1], is a Swedish 'nyckelharpist'. Amper 2010 won the World Championships in nyckelharpa. She is a member of the folk group The crowd with Jonas Bleckman (cello) and Anna Rousell (transverse flute). Amper debuted in 2012 with the album The Magic Bird, which was issued on Robert von Bahr's record label BIS Records. The disc was attended by among others Johan Hedin, Olle Linder and Anders Löfberg [2] and received good reviews in the press.