Entrelude
Entrelude is a musical and theatrical term for a short piece performed between two larger sections, such as acts, scenes, or set pieces, serving as a transitional or atmospheric bridge.
The word derives from the French entrelude, meaning between-lude or between-play, and has been used in English
In practice, entreludes were common in Baroque and early Classical opera and theater to smooth transitions
Today, entreludes are relatively obscure in everyday discourse and are primarily discussed in historical or scholarly
See also interlude, entr'acte, intermezzo, and intermission.