I'm having difficulty locating it now, but recently I read in the rules for international stations, that a station located within the USA could not broadcast to its own target zone, ie to the USA. Most programs targeted toward the USA are broadcast either from the Dutch Antilles, or other islands or continents surrounding the USA. That is why its called "international broadcasting" after all. VOA has transmission facilities around the globe, and because of their previous rules pertaining to broadcasting to the American people, its unlikely they have any arrays facing the continent. Anything heard within the borders of the US is probably due more to antenna limitations than by design. Also, referring to the rules, omnidirectional antennas are prohibited, so coast to coast coverage would be difficult..legally.
Unless you have lots of money to burn, music on shortwave would probably be a losing enterprise. So for the time being, we will have piracy

+-RH