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
Triangle (musical instrument) triangle in tenth-century manuscript, is of an instrument without rings. A triangle without rings is depicted in the King Wenceslaus IV Bible (late fourteenth century) and again on a mid-fifteenth-century window in the Beauchamp Chapel, St Mary's, Warwick. This latter triangle with its open corner has a curiously modern appearance, except that at the top angle the steel bar is twisted into a loop through which the thumb of the performer (an angel) passes. Like its ancestor the sistrum, the triangle was clearly used for religious ceremonies, quite widely in mediaeval churches.The triangle occurs more often than any other instrument