Sackbuts are a type of trombone from the Renaissance and Baroque eras, characterised by a telescopic slide that is used to vary the length of the tube to change pitch.
["The trombone is considered to be an incredibly important brass instrument in modern orchestras, brass ensembles and brass bands; balancing the high notes of the trumpet with the other instruments."]
["Although it may sound ironic, when pushed, the sackbut can easily make a loud and brassy sound, yet is also considered to respond well to soft playing - more than a modern trombon"]