Lusty Juventus is an example of an Entr'acte, more commonly known in French today as what? 
Robert Wever:  "An Enterlude called lusty Juventus", an interlude, attributed to him, was published in 1565. 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.
intermission