No notation has yet been found, if any in fact existed, to provide information as to how the dances actually were performed. Perhaps as more texts, reliefs and paintings are uncovered, more information will be found.
4600 Sunset Avenue, Indianapolis, Indiana 46208 • 800-368-6852
Image Source: POPSUGAR Photography / Hilary White
Gluck made a number of changes to the orchestration of Orfeo when adapting it from the original Italian version to the French version of 1774. Cornetts and chalumeaux are replaced by more common and modern oboes and clarinets , while the part played by trombones considerably decreases, possibly due to a lack of technical ability on the part of the French trombonists.  Cornetts were instruments that were typically used for church music, and chalumeaux were predominant only in chamber music : both cornetts and chalumeaux were unpopular in France in 1774.  In many ways the change from chalumeau to oboe corresponds to that from castrato to high tenor.  Neither castrato nor chalumeau were to survive.