Sackbut Sackbut A sackbut is 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. Unlike the earlier slide trumpet from which it evolved, the sackbut possesses a U-shaped slide, with two parallel sliding tubes, which allows for playing scales in a lower range. Records of the term "trombone" predates the term "sackbut" by two decades, and evidence for the German term "Posaune" is even older. "Sackbut", originally a French term, was used in England until the instrument fell into disuse in the
Sackbut don't have water keys, stockings, a leadpipe, or a slide lock, but as these parts are not critical to sound, replicas may include them. Bore size remained variable, as it still is today. The first reference to a slide instrument was probably "trompette des ménestrels", first found in Burgundy in the 1420s and later in other regions of Europe. The name distinguished the instrument from the "trompettes de guerre" (war trumpets), which were of fixed length. The next word to appear in the 15th century that implied a slide was the "sackbut" group of words. There are two theories for