 Valkyries have been the subjects of various poems , works of art and musical works . In poetry , valkyries appear in " Die Walküren " by H. Heine ( appearing in <unk> , 1847 ) , " Die Walküren " ( 1864 ) by H. v. Linge , " <unk> " ( appearing in <unk> Land , 1904 ) . 
