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
Keith Hill (musical instrument maker) of workshops on the craft of musical communication at conservatories and schools of music in Europe and the United States. In 2008 Hill established the Acoustical Technology Trainee program that is specific to the technical craft of enhancing sound, not instrument making, and has now taught keyboard instrument acoustics to a number of professional musicians and luthiers. Hill maintains a violin making workshop in Nashville, Tennessee. Keyboard instruments continue to be made in the larger Michigan workshop. Hill's instruments, which are known for their full tone, have been used in performances and recordings by keyboard artists such as Elizabeth Farr