An equale is a composition of music for several instruments of the same type. Most of the time, they are short festive pieces. Most of them were written to be played at funerals, or at days where the dead are remembered, such as All Souls' Day. The instrument commonly used is the trombone. Among the best known are probably "Drei Equale für vier Posaunen" WoO 30, by Ludwig van Beethoven (composed 1812), and "2 Aequale für 3 Posaunen" by Anton Bruckner, composed 1847.