Etude-Tableau: Allegro in A Minor Op. 39 No. 6 by Sergey Rachmaninoff. Sheet music and recordings of thousands of piano pieces by Sergey Rachmaninoff and many other famous composers to view in your digital device, print out or listen to. Etude-Tableau: Allegro in A Minor - Op. 39 No. 6 is a piece by the late romantic composer Sergey Rachmaninoff. It is written during the Late Romantic era and is included in Etudes-Tableaux by Rachmaninoff.