O Filii et Filiae (Variations) Set of seven variations begins with a solemn, forceful introduction, which leads to the statement of the theme on the clarinet stop alone. The six variations that follow explore the musical possibilities of the haunting minor theme: strong, brisk, melancholy (celestes against the pedal melody), far-away (trumpets muted), rhythmic, and exultant. Reproducible parts for trumpet included.