Question: Who did the composer of  Les fêtes d'Hébé replaced as the dominant composer of French opera?
Sentence (from "Les fêtes d'Hébé"): Les fêtes d'Hébé, ou Les talens lyriques ("The Festivities of Hebe, or The Lyric Talents") is an "opéra-ballet" in a prologue and three "entrées" (acts) by the French composer Jean-Philippe Rameau.
Relevant evidence: Yes