Maybe about ten or so years ago, there was an advert on British TV which was advertising a car that was sound-proofed.
A male driver was driving through a European city and every time he stepped out of his vehicle there were loud crowd noises but every time he sat in his car and closed the door, a song would play. It was a woman's operatic voice that was a relatively high pitched sound and was a really, really nice song.
Something tells me it was an Italian or French car manufacturer but I might be wrong.
I've been trying to locate the song for years and no luck.