This is a technical term in theater and movie arts for a stereotyped piece of music that is played to cue the audience that a scene is set in a particular location.
E.g.
London --> Rule Britannia
Italy --> O sole Mio
German --> Oompah music
New York/Broadway --> No Business like Show business
letimotif
but I think there is an even more specific term in the jargon. Aletimotif
can attach to characters or events, this attaches just to places.