Question: Lusty Juventus is an example of an Entr'acte, more commonly known in French today as what? 
Sentence (from "Entr'acte"): It can mean a pause between two parts of a stage production, synonymous to an intermission (this is nowadays the more common meaning in French), but it more often (in English) indicates a piece of music performed between acts of a theatrical production.
Relevant evidence: Yes