Sackbut as ballet "Don Juan" (1761). Some chamber music in this period includes trombone in an obligato role with voice, and also as a concerto instrument with string orchestra. Composers include the likes of Leopold Mozart, Georg Christoph Wagenseil, Johann Albrechtsberger, Michael Haydn and Johann Ernst Eberlin. For works for trombone post-1800, please see trombone. Many groups specializing in period music make frequent and prominent use of the sackbut. External links: Plenty of recordings of the authentic sackbut are now available from the groups such as Concerto Palatino, HMSC, Gabrieli Consort and the Toulouse Sacqueboutiers. For a closer examination of 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