Sackbut used as a clash until the Renaissance, when it became consonant in compositions, which went hand-in-hand with the widespread use of meantone temperament. During the 17th century, Well temperament began to become more and more popular as the range of keys increased. Temperament affects the colour of a composition, and therefore modern performances, typically employing equal temperament, may not be true representations of the composers' intentions. These old tunings are the result of the natural harmonic series of a brass instrument such as the sackbut. As the bell is smaller than a modern trombone, the harmonic series is closer to
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