Martinů composed The Mood for solo piano in Polička in 1917. The composition was never published and the manuscript is missing. Karel Šebánek states in his card catalog of Bohuslav Martinů's compositions that the work was completed and exists in manuscript form. The acronym "M. U." indicates that the last known location of the autograph was the archive of the Mojmír Urbánek publishing house. Šebánek also mentions the tempo marking of the composition – Andante.