The unfinished opera Modest Mussorgsky was written by a man who was a member of numeric group.
Salammbô (Mussorgsky): Salammbô (Russian: Саламбо, "Salambo" [alternative title: The Libyan (Russian: Ливиец, "Liviyets" )]) is an unfinished opera in 4 acts by Modest Mussorgsky. Modest Mussorgsky: Modest Petrovich Mussorgsky (Russian: Моде́ст Петро́вич Му́соргский ; ] ; 21 March [O.S. 9 March] 1839 – 28 March [O.S. 16 March] 1881 ) was a Russian composer, one of the group known as "The Five".
The Five