def build_song_rep(song, md_list=[u'title', u'artist', u'album'], divider=u' - '):
 filtered = filter_song_md(song, md_list, no_singletons=False)
 return divider.join(filtered)

def build_song_rep ( song , md_list = [ u'title' , u'artist' , u'album' ] , divider = u' - ' ) : filtered = filter_song_md ( song , md_list , no_singletons = False ) return divider . join ( filtered )
returns a string of the requested metadata types .