Equale
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An equale or aequale is a musical idiom. It is a piece for equal voices or instruments. In the 18th century the equale became established as a generic term for short, chordal pieces for trombone choir
Beethoven's funeral procession, led by a processional cross and four trombonists and sixteen singers performing Seyfried's voice arrangement of his Equali
Trombones announcing a death from the belfry and playing at a Moravian funeral in Bethlehem, Pennsylvania, 1874
Page 1 of "Drei Equale für vier Posaunen" ("Three Aequales for four Trombones") by Ludwig van Beethoven
Tower music
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Tower music is a musical performance from the top of a tower. It can also designate the music composed for or played in such a performance.
Equale
…were not necessarily equal in pitch, but formed a closed consort. Aequales were conventionally used in Austria to commemorate the dead. They were performed from towers on All Souls' Day (2 November), and on the previous evening. They were also performed at funerals. While aequales might be played by other instruments…
An alta capella playing from a tower.
A c. 1425 picture showing a "Turner" (Türmer, in modern German) named Peter.
The Neukirche (New Church), Leipzig in 1749
Tower music on Easter morning, 1890 illustration