The 1812 Overture Sound is a classical piece composed by Pyotr Ilyich Tchaikovsky in 1880 to commemorate the Russian victory over Napoleon's invading Grande Armee in 1812. The piece is known for its dramatic use of cannon fire, which is represented in the crossword solution 'BOOM'. This sound effect is used to signify the victory of the Russian forces and is one of the most iconic elements of the piece.