Kuss-Walzer

400 is a waltz by Johann Strauss II composed in 1881.

The waltz comprises melodies from Strauss' popular operetta Der lustige Krieg (The Merry War) and is an orchestral treatment of the act 2 aria "Nur für Natur" which was a hit when first performed.

Eduard Strauss, the composer's brother, first conducted the orchestral piece at the Court Ball in Vienna in 1882.

The introduction consists of arresting chords in the key of G major before proceeding discreetly into a quiet yet poignant waltz theme.

Despite being of such an economical structure, the waltz was well received at its first performance.