A brass aerophone is a musical instrument that produces sound by sympathetic vibration of air in a tubular resonator in sympathy with the vibration of the player's lips. Brass instruments are also called labrosones, literally meaning lip-vibrated instruments.
By Robert Wilde. By 1914, the six major powers of Europe were split into two alliances, which would â with the exception of Italy â form the two warring sides in World War One. Britain, France and Russia were in the Triple Entente, while Germany, Austria-Hungary and Italy were in the Triple Alliance.
1 Before World War 1 started, a series of defence alliances existed between many European countries. If one country declared war against another, other countries would be forced, by treaty, to enter the conflict.  France, Britain and Ireland, and Russia formed an alliance known as the Triple Entente.