Final answer:
Aaron Copland's 'Fanfare for the Common Man' utilizes B. brass and percussion instrument families, featuring a stirring melody and rhythmic accents.
Step-by-step explanation:
The instrument families utilized in Aaron Copland's Fanfare for the Common Man are brass and percussion. This piece is one of Copland's most popular works and is often played on ceremonial occasions and concerts. The composition features a bold and stirring melody played by the brass section, complemented by the resonant and rhythmic accents provided by the percussion instruments, including timpani, bass drum, and tam-tam.