Orfeo ed Euridice
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).