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.
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
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
Tower music
…Drei Equale für vier Posaunen" ("Three Aequales for four Trombones"), by Ludwig van Beethoven Aequale, a form of music played from a tower on All Souls' Day and its eve Alta cappella outdoor musical group…
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