Original: Grieg & Mendelssohn. Lyric Pieces, Book IV - Valse-Impromptu, Op. 47, No. 1. Complete Works For Piano. Version 2.0. Edvard Grieg.
Traducción: Grieg. Lyric Pieces, Livro I - Valsa, Op.. 12, No. 2. Lyric Pieces, Livro II - Valsa, Op.. 38, N ° 7.