One-step, H 127bis, for piano is a reminescence of the composer’s summer stay in Luhačovice and his infatuation with Milada Häuslerová, to whom he dedicated the piece. At that time, Martinů was playing popular repertoire in the colonnade with a part of the Czech Philharmonic. He met a girl from Přerov who had come to the spa for her holidays. He was immediately enamoured by the young Moravian, but their relationship was mainted mostly via letters. One-step is dated "1 January 1921 in Prague" on the manuscript. It is based on the modern dances that were imported into Europe from overseas after the World War I, like the charleston, the boston, or the foxtrot. However, the syncopated One-step failed to win Martinů the affections of his chosen one – Milada Häuslerová did not return to Luhačovice the following year.
Lucie Harasim Berná, Snadné klavírní skladby a tance. Praha: Bärenreiter Praha, 2016, s. 3–4.