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Micah
Since: Jan, 2001

Is there a name for when, during a show or movie, there's music playing which the audience assumes to be for the sake of mood and not in the world of the show and then we are shown it is indeed coming from a source in the characters' world? Sometimes it's just a radio, but when they're really pushing for a joke, it can be an orchestra or choir that is inexplicably nearby.
I just saw this on Scrubs, but the number of possible examples must be absurdly high.