independent moments for the instrumentalists and sometimes. Missa SS Trinitatis uses two choirs, which again points to the traditions going back to Gabrieli. His highly successful Requiem is for five vocal parts, two cornetts, two trombones, strings and continuo. He also uses the trombone in smaller motets and antiphons, such as his setting of Alma Redemptoris mater for soprano, alto trombone, strings and continuo. Some of his chamber music involves trombones, as do many of his operas, used as an obbligato instrument. Also in the Vienna court was Antonio Caldara, vice-kapellmeister 1717–1736. Among his output are two Holy Week settings as Da Capo arias: Deh sciogliete, o mesti lumi for soprano, unison violins, bassoon, two trombones and organ and Dio, qual sia for soprano, trombone, bassoon and basso continuo. 1750–1800 Again this period suffers from a lack of trombone players. Most of these works derive from Vienna and Salzburg. Joseph Haydn uses trombones in Il rotorno di Tobia, Die sieben letzten Worte, The Creation, Die Jahreszeiten, Der Sturm, Orfeo ed Euridice and secular cantata choruses. Wolfgang Amadeus Mozart uses trombones in connection with death or the supernatural. This includes the Requiem (K626, 1791), Great Mass in C minor (K423, 1783), Coronation Mass (C major) (K317, 1779), several other masses, Vesperae Solennes de Confessore (K339, 1780), Vesperae de Dominica, his arrangement of Handel's Messiah plus two of his three great operas: Don Giovanni (K527, 1787) and Die Zauberflöte (K620, 1791). Mozart's first use of the trombone was an obligato line in the oratorio Die Schuldigkeit des ersten Gebots (K35, 1767) Christoph Willibald Gluck includes trombones in five of his operas: Iphigénie en Aulide (1774), Orfeo ed Euridice (1774), Alceste (1776), Iphigénie en Tauride (1779) and Echo et Narcisse (1779), as well 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. Recordings 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 instrument, here are some recommended recordings where the sackbut is heavily featured in a "solo" capacity. Songs Without Words. Adam Woolf. SFZMusic 2010. Treasury of