Question: The unfinished opera Modest Mussorgsky was written by a man who was a member of numeric group.
Sentence (from "Salammbô (Mussorgsky)"): The fragmentary Russian language libretto was written by the composer, and is based on the novel "Salammbô" (1862) by Gustave Flaubert, but includes verses taken from poems by Vasiliy Zhukovsky, Apollon Maykov, Aleksandr Polezhayev, and other Russian poets.
Relevant evidence: No