An intriguing brief excerpt from Dubois' opera Miguela:
https://www.youtube.com/watch?v=YIGAtTM0lIg
Wikipedia has this entry:
Miguela, opéra (3 acts) (Originally unperformed, except prélude and second act tableau from Act 3, concert perf. 23 February 1896, Paris.) f.p. 18 May 1916, Opéra, Paris.