who is associated with the musical artists from stevie nicks and joan armatrading ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_associatedMusicalArtist dbr_Stevie_Nicks sep_dot var_uri dbo_associatedMusicalArtist dbr_Joan_Armatrading sep_dot var_uri a dbo_MusicalArtist brack_close